Journal List > Nutr Res Pract > v.14(4) > 1145125

Kang and Shim: Development of a food frequency questionnaire for dietary intake of preschool children

Abstract

BACKGROUNDS/OBJECTIVES

To describe the data-based development of a food frequency questionnaire (FFQ) for dietary evaluation of Korean preschool children.

SUBJECTS/METHODS

Development of the FFQ was based on the data from 2,766 preschool children aged 1–5 years, who had completed 24-hour dietary recalls in the 2009–2013 Korea National Health and Nutrition Examination Survey. We selected the food list based on the results of nutritional contribution and between-person variability for energy and 13 nutrients. We selected 88 foods with over 80% of total contribution to each nutrient and with over 80% of accumulated r2 for each nutrient. A dish containing any of the 88 foods in the recipe was listed, and a total of 903 dishes were extracted. Among the 903 dishes, we selected 438 dishes contributing more than 1% of total consumption.

RESULTS

FFQ included 116 dish items combined from 438 dishes based on nutrient profile and recipe. Quantities of dietary intake were assessed by nine categories of frequency and portion size option. In addition, when comparing the food portions of children with the reference portion size, subjects would be asked to select one of three response categories (less, similar, and more) and then to record the amount as a percentage for the reference portion. Percentages of coverage for energy, protein, fat, and carbohydrate were 89.2%, 88.4%, 88.2%, and 89.4%, respectively.

CONCLUSIONS

The dietary intake of Korean preschool children can be assessed by this new data-based FFQ. In addition, the new instrument can be used to identify nutritional needs of target groups for planning nutrition education and strategies to improve diet. Further studies are warranted to evaluate the performance of the instrument.

INTRODUCTION

During early childhood, eating behaviors are established and can have long-term effects on growth and health [12]. Being underweight or stunted are both associated with an increased mortality, morbidity, and impaired development of children [3]. In contrast, being overweight or obese has immediate physical and mental health implications for a child, and both are risk factors for cardiovascular disease and diabetes in adults [3]. Diet is an important factor of growth and development during childhood. Therefore, it is important to accurately assess the dietary intake among preschool children.
Early childhood is a life phase where the assessment of dietary intake is particularly challenging because of many unique respondent and observer considerations [45]. For this age group, one must consider low literacy skills, limited attention span, limited memory, limited knowledge of food and food preparation, rapidly changing food habits, and dietary reporting by surrogate respondents [46]. As a consequence of these challenges, studies developing dietary measurement tools for preschool children are very limited.
A food frequency questionnaire (FFQ) is commonly used as an assessment tool for collecting usual dietary intake. It generally consists of a list of food items, frequencies of consumption, and portion sizes as either single or multiple categories [78]. One of the most frequently used methods to develop a new FFQ is by applying a data-based approach, which selects not only the food list, but also the quantitation, which includes the nutrient content and the portion size for most of the foods and nutrients consumed by the target population [9]. FFQs developed for preschool children are very few compared to those for the adult population. However, several FFQs have been developed targeting preschool age children [510111213].
In the Korea National Health and Nutrition Examination Survey (KNHANES), a daily dietary intake assessed by 24-hour dietary recall (24HDR) is conducted for the population of one year of age or older. However, only the age group of 19 to 64 years is surveyed for the usual dietary intake by FFQ [14]. In other words, there is no comprehensive dietary assessment tool for estimating the usual dietary intake of preschool children in Korea. Therefore, the primary goal of this study was to design a food frequency questionnaire for a comprehensive assessment of dietary intake in Korean preschool children using the data-based approach.

SUBJECTS AND METHODS

Data source

We developed the FFQ based on the data from 2,766 preschool children aged between 1 and 5 years who had completed 24HDR in the 2009–2013 Korea National Health and Nutrition Examination Survey. The KNHANES is a nationally representative, cross-sectional survey and consists of the following three surveys: a health interview, a health examination, and a nutrition survey. Detailed information on the method and data of KNHANES is available [14]. The Korea Centers of Disease Control and Prevention Institutional Review Board approved the survey protocol (approval No. 2009-01CON-03-2C, 2010-02CON-21-C, 2011-02CON-06-C, 2012-01EXP-01-2C, and 2013-07CON-03-4C), and all guardians of the participants provided written informed consent.

Food list

The process of selecting dish items for the FFQ consisted of four steps as shown in Fig. 1 [79]. First, we tried to identify foods most predictive of between-person variability using cumulative r2 and nutritional contribution to total consumption for energy and 13 nutrients (protein, fat, carbohydrate, calcium, phosphorous, iron, sodium, potassium, vitamin A, thiamin, riboflavin, niacin, and vitamin C) [15]. We calculated the nutritional contribution based on the percent contribution of each food (“y1”) as
y1=Nutrient Intake Provided by Specific FoodTotal Nutrient Intake×100nrp-14-374-e001.jpg
Fig. 1

Selection of dish items.

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We excluded foods that accounted for less than 0.5% of total consumption in order to exclude foods consumed in large quantities by only a few participants [16]. To assess the between-person variation in nutrient intake, we carried out stepwise multiple regressions, and included the total nutrient intake from all foods as a dependent variable, and included nutrient intakes provided by each food as independent variables. We thus selected 88 foods that made over 80% of the total contribution to each nutrient and over 80% of accumulated r2 for each nutrient.
Second, we listed dishes containing any of 88 foods in the recipe and identified a total of 903 dishes. Third, we identified the percent contribution of each of the 903 dishes to the consumption of 88 foods. In this analysis, we selected 438 dishes contributing more than 1% of total consumption from the 903 dishes. Percent contributions of each dish (“y2”) in intake of each food were calculated as,
y2=Specific Food Intake Provided by Specific Dish (g)Total Consumption of Specific Food g×100nrp-14-374-e002.jpg
Finally, some of these 438 dishes were combined based on the nutrient profile and recipe into 116 items for the food list in the newly developed FFQ.

Frequency response section

Frequency questionnaire was designed to obtain the consumption frequency of each dish item for a month. Frequency response choices for dish items were categorized into nine groups with more allocation for more frequent intake: one non-consumption response, two monthly base responses, three weekly bases responses, and three daily bases responses.

Portion sizes

Reference portion size for each dish item was based on typical serving size as reflected in the distribution from the one-day 24HDR of 2,766 preschool children in the 2009–2013 KNHANES. For countable items such as strawberry, gram weight derived from the distribution was compared with the gram weight in the book [1718]. For mixed dishes, gram weight and volume were confirmed after cooking according to the derived recipe.

Development of a nutrient database

We developed the nutrient database for FFQ for preschool children according to the data-based approach [91119]. Nutrient content per 100 g of the 116 items in the FFQ was derived from the one-day 24HDR of the 2,766 preschool children aged between 1 and 5 years in the 2009–2013 KNHANES. We calculated the energy and nutrient intakes of KNHANES data based on the 8th edition of the Standard Food Composition Table from the Rural Development Administration by the KNHANES survey team [14]. Energy, macronutrients (protein, fat, and carbohydrate), five minerals (calcium, phosphorous, iron, sodium, and potassium), and five vitamins (vitamin A, thiamin, riboflavin, niacin, and vitamin C) content were contained in the nutrient database.
In order to examine how the developed FFQ assessed the dietary intake of preschool children, we calculated the percentage coverage of energy and 13 nutrients that can be assessed by the FFQ based on the nutrient database for preschool children FFQ. The percentage coverage of each nutrient (“y3”) was calculated as
y3=Nutrient Intake Calculated from 116 Items in FFQ for Korean Preschool ChildrenTotal Nutrient Intake×100nrp-14-374-e003.jpg
Data were analyzed using SAS 9.4 (SAS Institute, Inc., Cary, NC, USA).

RESULTS

Food list

Fig. 2 shows the example of FFQ for the dietary evaluation of Korean preschool children. This FFQ examines the intake frequency and portion size for 116 items to assess the dietary intake of Korean preschool children. For calibration purpose, we added a question for the number of meals (i.e., Korean staple dishes such as rice or noodles) a day. Participants (i.e., primary caregivers) would be asked how often their children had consumed each dish item for the past month. Finally, 116 dish items were presented as shown in Table 1. Dish items of questionnaire consisted of 15 Korean staple dishes, including cooked rice and noodles, 14 soups and stews, 53 side dishes including cooked and seasoned vegetables, kimchi, grilled and boiled fish or meat foods, 8 breads and baked products, 13 dairy products and beverages, and 13 fruits.
Fig. 2

Example of the food frequency questionnaire for Korean preschool children: dish items of cooked rice group.

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Table 1

Number of items selected for the food frequency questionnaire for Korean preschool children

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Item groups Items No. of items
Cooked rice “white rice”, “multi-grain rice”, “gimbap”, “fried rice”, “bibimbap”, “curry and rice”, “rice ball” 7
Noodles and dumplings “banquet noodles, spicy mixed noodle with vegetable”, “buckwheat noodle, chilled buckwheat noodle soup, udon noodle, hand-made noodles in broth, sliced rice cake soup”, “spaghetti”, “instant noodle”, “black bean paste noodle, rice with black bean sauce”, “dumpling”, “porridge (rice porridge with vegetables, pumpkin porridge, rice porridge with sesame, rice porridge with peanut, rice with assorted grains porridge)”, “porridge (rice porridge with chicken, rice porridge with beef, rice porridge with abalone, rice porridge with canned tuna)” 8
Soups “potato soup”, “egg soup”, “soybean paste soup, “radish soup”, “seaweed soup”, “dried Alaska pollack soup”, “beef leg bone soup, thick beef bone soup”, “chicken and ginseng soup”, “beef soup”, “fish paste soup”, “beef soup with seasoned red pepper sauce, chicken soup with seasoned red pepper sauce”, “bean sprout soup” 11
Stews “kimchi stew”, “soybean paste stew, fermented soybean paste stew”, “spicy soft tofu stew” 3
Cooked and seasoned vegetables “stir-fried shredded potato, braised potato”, “grilled laver”, “perilla leaves (seasoned perilla leaves, steamed perilla leaves, perilla leaf Kimchi, perilla leaves)”, “stir-fried mushroom”, “seasoned radish, cooked”, “seasoned radish”, “stir-fried sea mustard stem”, “seasoned spinach, cooked”, “braised lotus root, braised burdock”, “seasoned cucumber”, “stir fried noodles with vegetables”, “vegetable salad”, “seasoned soybean sprouts, cooked”, “braised bean”, “seasoned young pumpkin, cooked” 15
Eggs and tofu “steamed egg”, “pan-fried egg, rolled omelette, scrambled eggs”, “boiled egg, braised egg”, “tofu (steamed, pan-fried, braised)” 4
Pan-fried food “Kimchi pancake, chive pancake, welsh onion pancake”, “pan-fried meat rolls, pan-fried fishcake, pan-fried shrimp cake”, “pan-fried young pumpkin” 3
Kimchi “Kimchi”, “Radish root and leaves Kimchi”, “Pickled radish” 3
Grilled and boiled fish or meat foods “chicken (spicy grilled, braised, steamed, grilled)”, “Grilled duck”, “grilled pork (grilled pork ribs, grilled pork belly)”, “pork (stir-fried, braised, braised pork seasoned with soy sauce)”, “Beef (bulgogi, stir-fried, steamed, soy sauce braised)”, “grilled beef (grilled beef ribs, steak)”, “grilled short rib patties, hambak steak”, “grilled ham, pan-fried ham, stir-fried sausage”, “grilled yellow croaker, grilled salt-dried croaker”, “mackerel (grilled, braised)”, “squid (stir-fried, seasoned, boiled)”, “dried squid (stir-fried, seasoned, braised)”, “stir-fried fish paste, braised fish paste, boiled fish paste”, “stir-fried anchovy, braised anchovy”, “canned tuna” 15
Fried food “french fries”, “fried laver”, “fried chicken, fried chicken with sweet and spicy sauce, fried boneless chicken with sweet and spicy sauce”, “pork cutlet”, “fried squid, fried shrimp”, “sweet and sour fried pork” 5
Breads and baked products “doughnut”, “red beans bread, cream bun”, “sandwich”, “bread, streusel bread, morning roll, Castella, mocha bread”, “cake”, “pizza”, “hotdog, sausage bread, hamburger”, “Stir-fried rice cake” 8
Grain, starch, and grain products “potato (steamed, baked)”, “sweet potato (steamed, baked)”, “corn (steamed, baked)”, “rice cake (steamed white rice cake, a stick of rounded rice cake, rice cake stuffed with syrup, half-moon-shaped rice cake, steamed rice cake with red beans, glutinous rice cake with bean flour, pounded rice cake, glutinous rice cake)” 6
Snack “snack, rice snack, Korean traditional rice cookies”, “cookie, cracker “ 2
Ice cream “sherbet”, “ice cream” 2
Dairy products and beverages “powdered formula”, “drinking yogurt”, “yogurt”, “milk”, “cheese”, “soy milk”, “Parched barley powder drink”, “sports drink”, “orange juice”, “vegetable juice”, “sugar sweetened beverage” 11
Fruits “persimmon”, “mandarin”, “strawberry”, “banana”, “pear”, “peach”, “apple”, “watermelon”, “orange”, “oriental melon”, “kiwi”, “tomato”, “grape” 13
Total 116

Frequency response section and portion sizes

Frequency response choices for dish items were “never or hardly ever,” “once a month,” “2 to 3 times a month,” “once a week,” “2 to 4 times a week,” “5 to 6 times a week,” “once a day,” “2 times a day,” and “3 times a day.” Reference portion size for each item was provided. For dish items such as “powdered formula”, “yogurt”, “milk”, “soy milk”, and “juice”, the reference portion size was determined as median value of consumed gram amount among preschool children aged 1–2 years. For other items, the reference portion size was determined as median value of preschool children aged 3–5 years. Countable items such as strawberry were given in natural units (e.g., 1, 2, and 3). Portion sizes of mixed dishes were given in specific amounts (e.g., 1 spoon, 1/3 cup, and 1 cup, etc.). In addition, we designed response choices for portion size as “less than”, “similar to”, or “more than” the reference portion size. If either “less” or “more” was selected, participants would be asked to record a percentage for the reference portion.

Nutrient database

Nutrient contents per 100 g were produced as a weighted mean value, multiplied by the intake proportion of the individual foods for each dish item. Table 2 presents examples of nutrient database. For example, energy content per 100 g of six individual foods belonging to “chicken (spicy grilled, braised, steamed, grilled)” item ranged from 111.7 kcal (“spicy braised chicken”) to 189 kcal (“grilled chicken drumsticks”). After adjusting the frequency weight of each individual food, energy content per 100 g of “chicken (braised, grilled)” item was 124.3 kcal.
Table 2

Examples of nutrient database of food frequency questionnaire for preschool children: content of energy and macronutrients with composition of each item

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Item groups Items Nutrient content1) Composition of item2)
Energy (kcal/100 g) Protein (g/100 g) Fat (g/100 g) Carbohydrate (g/100 g) Individual foods Frequency Energy (kcal/100 g) Protein (g/100 g) Fat (g/100 g) Carbohydrate (g/100 g)
Cooked rice White rice 369.8 6.4 0.5 81.3 White rice 2,463 369.8 6.4 0.5 81.3
Noodles and dumplings Banquet noodles, spicy mixed noodle with vegetable 212.1 6.7 2 40.4 Noodles 102 222 7 1.3 43.2
Spicy mixed noodle with vegetable 129 216.4 7 3.2 39.2
Banquet noodles 1,394 207.9 6.5 2 39.7
Soups Potato soup 59.9 4.2 0.8 10 Potato soup 414 59.9 4.2 0.8 10
Stews Kimchi stew 77.4 6.7 4.6 3.6 Kimchi stew 699 80.8 6.5 5.2 3.4
Kimchi stew with canned tuna 369 69 7 3.5 3.8
Kimchi stew with pork 271 82.7 6.5 4.6 3.8
Cooked and seasoned vegetables Stir-fried shredded potato, braised potato 81.6 2.5 1.9 14.4 Stir-fried shredded potato 561 84.9 2.6 2.3 14.4
Stir-fried shredded potato with vegetables 333 71.2 2.4 1.5 13
Stir-fried potato 157 73.6 2.4 1.5 13.4
Braised potato 751 86.4 2.7 1.7 16
Eggs and tofu Steamed egg 120.2 9.9 7 3.5 Steamed egg 1,076 120.2 9.9 7 3.5
Pan-fried food Kimchi pancake, chive pancake, welsh onion pancake 189.6 8.8 7.2 23.8 Kimchi pancake 544 185.1 7.3 8.2 21.7
Chive pancake 302 186.6 9.3 6.1 25.4
Vegetable pancake 240 184.8 7.1 8.5 20
Welsh onion pancake with sea food 95 203.6 11.6 7 25.6
Vegetable pancake with zucchini 57 192.6 7.8 7.8 26.3
Kimchi Kimchi 19.2 1.9 0.4 4 Kimchi 1,983 19.2 1.9 0.4 4
Grilled and boiled fish or meat foods Chicken (spicy grilled, braised, steamed, grilled) 124.3 15.9 3.6 6.9 Braised chicken 391 114.9 13 3.5 7.9
Chicken brochette 12 129.7 26.6 1.6 2.1
Grilled chicken 75 134.9 26.2 1.9 2.6
Grilled chicken drumsticks 17 189 16.9 11.4 3.2
Spicy grilled chicken 670 117.2 12 3.8 9.3
Spicy braised chicken 492 111.7 12.9 2.9 8.6
Fried food French fries 101.4 1.8 5 12.6 French fries 92 101.4 1.8 5 12.6
Breads and baked products Doughnut 365.7 6.9 13.8 53.1 Twisted bread stick 120 355.6 7.9 11 54.6
Doughnut 26 357.4 6.4 20 38.8
Ring-shaped doughnut 19 367.3 6.4 22.9 35.8
Sweet rice doughnut 53 390.3 5.9 7.6 74.1
Grain, starch, and grain products Potato (steamed, baked) 65.7 2.8 0 14.5 potato (steamed, baked) 49 65.7 2.8 0 14.5
Snack Snack, rice snack, Korean traditional rice cookies 481.8 5.9 21.8 65.4 Snack 697 495.6 6.6 23.1 65
Rice snack 71 452.7 3.3 15.2 77.5
Wafer 40 505.4 4.4 25.4 66.2
Chips 47 418.2 4.8 20.9 54
Korean traditional rice cookies 18 380.3 5.2 5.1 78.9
Honey cookie 15 462.2 4.1 14.5 78
Ice cream Sherbet 130.1 1.6 1.2 28.5 Frozen desserts 119 127.1 0.9 1.1 28.5
Sherbet 50 127.9 0.9 1.1 28.7
Milkshake 9 182.3 13.7 2.1 27.4
Dairy products and beverages Powdered formula 375.5 15 17.5 40.7 Powdered formula 404 375.5 15 17.5 40.7
Fruits Persimmon 80.4 0.8 0 22.1 Persimmon 145 80.4 0.8 0 22.1
1)Resulted from the nutrient composition and frequency weight of individual foods included in each item.
2)Frequencies and nutrient contents of individual food were obtained from dietary intake data of 2,766 preschool children aged between 1 and 5 years in the 2009–2013 Korea National Health and Nutrition Examination Survey.

Performance of questionnaire

Percentage coverage of energy from the selected 116 items was 89.2%; the percentage coverage of protein, fat, and carbohydrates was 88.4%, 88.2%, and 89.4%, respectively (Table 3). The percentage coverage for sodium (82.9%) was lowest, whereas those for calcium (91.4%) were highest of the minerals. In vitamins, the percentage coverage was lowest for vitamin A (87.6%) and highest for riboflavin (91.7%). The percentage coverage of the target nutrients was more than 80% in both age groups.
Table 3

Percentage coverage of energy and 13 nutrients from the selected 116 items in FFQ for Korean preschool children

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Nutrients Coverage (%)1)
All 1–2 years 3–5 years
Energy 89.2 90.6 88.4
Protein 88.4 89.8 87.6
Fat 88.2 90.4 87.0
Carbohydrate 89.4 90.6 88.7
Calcium 91.4 92.9 90.3
Phosphorus 90.4 91.7 89.6
Iron 85.0 86.9 83.9
Sodium 82.9 85.3 81.7
Potassium 89.1 90.8 88.2
Vitamin A 87.6 89.6 86.3
Thiamin 90.4 91.6 89.8
Riboflavin 91.7 93.3 90.7
Niacin 88.4 89.8 87.7
Vitamin C 91.4 92.8 90.6
FFQ, food frequency questionnaire.
1)Percentage coverage of each nutrient was calculated as: (Nutrient Intake Calculated from 116 Items in FFQ for Korean Preschool Children)/(Total Nutrient Intake)*100.

DISCUSSION

Dietary intake during childhood is important for growth and health, but studies on dietary measurement tools for preschool children are limited. Our study developed an FFQ for Korean preschool children using a data-based approach. We identified dish items and portion sizes for each item of this newly developed FFQ by using the data from 2,766 preschool children aged between 1 and 5 years in the 2009–2013 KNHANES. We selected a total of 116 dish items and created nine frequency categories and three portion size response choices for each item. We compiled a nutrient composition database per 100 g for each dish item using the recipes from the 2,766 preschool children.
In order to develop a new FFQ for a group study, it is necessary to select a food list that reflects the diet of the target population. For example, in a previous study, to estimate habitual dietary intake among Japanese children, an FFQ was developed with 75 food items [11]. The food items were selected using a contribution analysis to include items that contribute greatly to energy and nutrient intake and used a multiple regressions analysis to consider the between-person variance in the nutrient intake based on the data from 586 children's dietary data [11]. In our study, we selected a list of foods using data-based method, and selected 116 items based on the dishes that contain foods resulting from the contribution analysis and variation analysis for energy and 13 nutrients using the target population dietary data. The FFQ can identify the food source that contributes to the specific nutrient intake and can also provide information on what type of dish is being consumed, including the food source, since we selected the dish items in two stages (food list selection, and dish item choices including the selected foods). For example, major food sources of iron intake among 1-5 years Korean preschool children were “white rice” and “egg.” “White rice” was mainly consumed as “cooked rice and multi-grain rice” and “egg” was mainly consumed as “fried egg, boiled egg, rolled omelet, steamed egg, and gimbap.” From this separate process of food list selection and dish item choices, extra coverage was accomplished, resulting in measuring intake of more than 87% of total consumption for most nutrients other than sodium.
Portion sizes either with multiple options or as a reference portion are necessary for calculating gram weights or nutrient intakes [20]. In a systematic review evaluating 17 studies of the FFQ validation for 12- to 36-month-old children, six studies used household measures/standard portion sizes to estimate the portion sizes, and three studies used portion sizes derived from the national nutrition survey data [5]. Our study designed the portion size with three options of “less than,” “similar to,” or “more than” the reference portion size, and in turn, we set reference portion size as a typical portion size based on the consumption distribution from the national survey data. Furthermore, a percentage of intakes compared to the reference portion size was asked if either “less” or “more” was selected. The strength of this design is its capacity to measure in detail the actual intake of participants whose eating behaviors are established during early childhood. In addition, this design is also consistent with previous research reporting correlation coefficients as being highest when subjects were able to describe their own portion size as compared with no portion size specified or portion size specified on the questionnaire [21].
Assigned recall interval of FFQ ranged from the previous seven days to the previous year for the 12- to 36-month-old children, and ranged from the previous month to the previous year for children 3 to 12 years old [51012222324]. In this study, we assigned the recall period of FFQ as the previous month. This short recall period is expected to have a good correlation with the dietary habits of the participants, but several repeated survey are needed to reflect long-term dietary habits.
To measure dietary intake using FFQs, a nutrient database is required for each food item in addition to the selected food list, portion size for each food item, and frequency of consumption for each food item. Compared with other open-ended dietary assessment methods, such as 24HDRs or food records, FFQs already had selected food items, and each item contains a variety of foods depending on the purpose of the study. Therefore, it is important to assign a nutrient value to each item to represent a composite value for the possible variants of the items queried [25]. To do this, we developed a nutrient composition database for each item of the FFQ for Korean preschool children using recipes from the national dietary survey data for the same target-age group.
Coverage rates of energy and all nutrients based on the selected dish items in the newly developed FFQ ranged from 82.9% (sodium) to 91.7% (riboflavin). Few studies are directly comparable. However, our coverage rates were similar to those from the FFQ for Japanese children aged 3–11 years [88.6% (vitamin C) to 97.8% (alpha-carotene)] [11]. In addition, the mean percentage coverage of nutrient intake was 82.4% by FFQ with 94 food items developed for Korean adults aged 30 years and older [26] and 92.3% by FFQ with 95 dish items developed for Korean adults aged 20 years and older [27].
In conclusion, this study is the first to develop a FFQ for preschool children using national data in Korea. The dietary intake of Korean preschool children can be assessed by this new data-based FFQ. In addition, the new instrument can be used to identify the nutritional needs of target groups for planning nutrition education and strategies to improve diet. Further studies are warranted to evaluate the performance of the instrument (e.g., reliability and validity).

Notes

Funding: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science and ICT; MSIT) (grant No. 2016R1D1A1B03931820).

Conflict of Interest: The authors declare no potential conflicts of interests.

Author Contributions:

  • Conceptualization: Shim JE, Kang M.

  • Formal analysis: Kang M.

  • Funding acquisition: Shim JE.

  • Methodology: Shim JE, Kang M.

  • Project administration: Shim JE.

  • Supervision: Shim JE.

  • Visualization: Kang M.

  • Writing - original draft: Kang M.

  • Writing - review & editing: Kang M, Shim JE.

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