Journal List > Pediatr Allergy Respir Dis > v.21(3) > 1033126

Lee, Kim, Cho, Kim, Suh, Ahn, Cheong, and Lee: Comparison of Prevalence and Risk Factors of Atopic Dermatitis by Physical Examination and Questionnaire Survey in Elementary School Children

Abstract

Purpose

The present study aimed to evaluate the accuracy of determining the prevalence of atopic dermatitis (AD) with a questionnaire by diagnosing AD with both a questionnaire and pediatricians' physical examinations and to determine the possible risk factors for AD.

Methods

A survey was conducted from December 2008 to February 2009 in four elementary schools. The Korean version of the International Study of Asthma and Allergies in Childhood written questionnaire (WQ) was used to identify AD ever and AD during the last 12 months. Current AD was diagnosed by well-trained pediatricians according to the Hanifin and Rajka's diagnostic criteria. A total of 2,729 children who completed the questionnaire and underwent a physical examination by pediatricians were included in this analysis.

Results

According to the WQ, the prevalence of AD in the entire life and in the last 12 months was 18.4% and 12.9%, respectively. The prevalence of clinically diagnosed AD by pediatricians was 8.8%. There was a significant positive relationship between the prevalence of AD diagnosed by physical examination and past history of allergic rhinitis (adjusted odds ratio [aOR], 1.45), allergy history of the mother (aOR, 2.48), and AD history of the mother (aOR, 1.61). According to the WQ, there was also a significant positive relationship between the prevalence of AD in the last 12 months and past history of asthma (aOR, 2.55) and AD history of the mother (aOR, 1.71).

Conclusion

Prevalence and risk factors of AD were different according to the survey methods. When prevalence of AD is determined with a questionnaire in the future, more careful attention should be used, because the result can be overestimated compared to the actual prevalence.

References

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Fig. 1.
Scheme of subject eligibility for this study. AD, atopic dermatitis.
pard-21-186f1.tif
Table 1.
Age and Gender Profile of the Subjects
  Incheon (n=779) Gwangju (n=1,142) Busan (n=450) Ulsan (n=358) Total (n=2,729)
Age (yr)          
  7 155 (19.9) 200 (17.5) 91 (20.2) 52 (14.6) 498 (18.2)
  8 183 (23.5) 215 (18.9) 114 (25.3) 71 (19.8) 583 (21.4)
  9 149 (19.1) 223 (19.5) 85 (18.9) 61 (17.0) 518 (19.0)
  10 155 (19.9) 254 (22.3) 66 (17.1) 88 (24.6) 574 (21.0)
  11 137 (17.6) 250 (21.9) 83 (18.5) 86 (24.0) 556 (20.4)
Gender          
  Male 394 (50.6) 583 (51.1) 225 (50.0) 204 (57.0) 1,406 (51.5)
  Female 385 (49.4) 559 (48.9) 225 (50.0) 154 (43.0) 1,323 (48.5)

Values are presented as number (%).

Table 2.
The Prevalence of Atopic Dermatitis by ISAAC Questionnaire and Physical Examination
  No. of Subject ISAAC questionnaire Physical examination
AD, Ever Prevalence (95% CI) AD, last 12 mo Prevalence (95% CI) AD Prevalence (95% CI)
Age (yr)              
  7 498 93 18.7 (15.1–22.2) 58 11.6 (9.0–14.9) 35 7.0 (4.9–9.6)
  8 583 116 19.9 (16.6–23.2) 85 14.5 (11.7–17.4) 63 10.8 (8.2–13.3)
  9 518 91 17.6 (14.3–20.9) 72 13.9 (10.9–16.8) 48 9.2 (6.7–11.7)
  10 574 113 19.7 (16.4–23.0) 78 13.5 (10.7–16.4) 56 9.7 (7.3–12.1)
  11 556 93 16.7 (13.6–19.8) 59 10.6 (8.0–14.1) 40 7.1 (5.0–9.3)
Gender              
  Male 1,406 215 15.3 (13.4–17.2) 143 10.1 (8.5–1.7) 112 7.9 (6.5–9.3)
  Female 1,323 288 21.8 (10.6–24.1) 209 15.8 (13.8–17.7) 130 9.8 (8.2–11.4)
Districts              
  Incheon 779 163 20.9 (18.0–23.8) 114 14.6 (12.1–17.1) 88 11.3 (9.0–13.5)
  Gwangju 1,142 202 17.7 (15.5–19.9) 137 12.0 (10.1–13.8) 98 8.5 (6.9–10.2)
  Busan 450 76 16.9 (13.4–20.3) 57 12.6 (9.5–15.7) 29 6.4 (4.1–8.7)
  Ulsan 358 63 17.5 (13.6–21.6) 44 12.2 (8.8–15.7) 27 7.5 (4.7–10.2)
Total 2,729 505 18.4 (17.0–19.9) 352 12.9 (11.6–15.7) 242 8.8 (7.8–9.9)

ISAAC, International Study of Asthma and Allergies in Childhood; AD, atopic dermatitis; CI, confidence interval.

Table 3.
Relationship between the Diagnosis of Atopic Dermatitis by ISAAC Questionnaire and Physical Examination
  Physical examination Total
AD (+) AD (−)
ISAAC questionnaire (AD ever)
  AD (+) 172 332 504
  AD (−) 70 2,155 2,225
ISAAC questionnaire (AD last 12 mo)
  AD (+) 157 195 352
  AD (−) 85 2,292 2,377
Total 242 2,487 2,729

ISAAC, International Study of Asthma and Allergies in Childhood; AD, atopic dermatitis.

Table 4.
Severity of Atopic Dermatitis Determined by Physical Examination
  No. of subject Mild AD n (%) Moderate to severe AD n (%) Mean SCORAD (95% CI)
Age (yr)        
  7 35 22 (62.9) 13 (37.1) 13.9 (10.8–16.6)
  8 63 34 (54.0) 29 (46.0) 15.2 (13.4–17.0)
  9 48 20 (41.7) 28 (58.3) 16.4 (14.1–18.6)
  10 56 29 (51.7) 27 (48.2) 15.6 (13.4–17.9)
  11 40 17 (42.5) 23 (57.5) 16.1 (14.1–18.1)
Gender        
  Male 112 66 (58.9) 46 (41.1) 14.2 (12.9–15.6)
  Female 130 56 (43.1) 74 (56.9) 16.6 (15.2–17.9)
Districts        
  Incheon 88 35 (40.0) 53 (60.0) 17.4 (15.6–19.3)
  Gwangju 98 55 (56.1) 43 (43.9) 14.0 (12.9–15.2)
  Busan 29 19 (65.5) 10 (34.5) 13.0 (10.9–15.0)
  Ulsan 27 13 (48.1) 14 (51.9) 17.1 (13.6–20.7)
Total 242 122 (50.4) 120 (49.6) 15.5 (14.5–16.4)

AD, atopic dermatitis; SCORAD, SCORing of atopic dermatitis, CI, confidence interval.

Table 5.
Association of Risk Factors with Atopic Dermatitis Diagnosed by Questionnaire and Physical Examination
  ISAAC questionnaire (n=352) Physical examination (n=242)
n (%) aOR (95% CI) n (%) aOR (95% CI)
Living with a dog or cat 13 (3.7) 1.22 (0.58–2.61) 10 (4.1) 0.79 (0.38–1.68)
Passive smoking 61 (17.3) 1.23 (0.79–1.91) 46 (19.0) 1.24 (0.85–1.80)
Diagnosis of asthma 37 (10.5) 2.55 (1.24–5.27) 28 (11.5) 1.90 (0.98–3.69)
Diagnosis of allergic rhinitis 114 (32.4) 1.36 (0.89–2.08) 79 (32.6) 1.45 (1.01–2.07)
Paternal allergy 42 (11.9) 1.32 (0.62–2.82) 25 (10.3) 0.83 (0.42–1.63)
Paternal atopic dermatitis 25 (7.1) 1.17 (0.65–2.10) 23 (9.5) 1.33 (0.81–2.20)
Maternal allergy 54 (15.3) 1.34 (0.62–2.91) 37 (15.3) 2.48 (1.30–4.73)
Maternal atopic dermatitis 33 (9.3) 1.71 (1.00–2.91) 30 (12.4) 1.61 (1.00–2.59)

aOR, adjusted odds ratio; CI, confidence interval.

Multiple logistic regression analysis was used to assess the relationship between atopic dermatitis and all the parameters. OR was adjusted by age, sex, body mass index, districts and observers and its 95% CI of risk factors.

P<0.05

Table 6.
Risk Factors Associated with Severity of Atopic Dermatitis
  Normal: mild AD Normal: moderate to severe AD
n (%) aOR (95% CI) n (%) aOR (95% CI)
Living with a dog or cat 6 (5.0) 0.69 (0.25–1.93) 4 (3.2) 0.64 (0.23–1.79)
Passive smoking 21 (17.5) 1.13 (0.69–1.85) 25 (20.5) 1.13 (0.69–1.87)
Diagnosis of asthma 12 (10.0) 1.90 (0.83–4.37) 16 (13.1) 2.36 (1.07–5.20)
Diagnosis of allergic rhinitis 34 (28.3) 1.37 (0.88–2.13) 35 (28.7) 1.41 (0.89–2.23)
Paternal allergy 14 (11.7) 0.61 (0.24–1.58) 11 (9.0) 1.20 (0.49–2.95)
Paternal atopic dermatitis 8 (6.7) 1.21 (0.63–2.31) 15 (12.3) 1.54 (0.80–2.98)
Maternal allergy 16 (13.3) 2.01 (0.84–4.80) 21 (17.2) 2.58 (1.06–6.25)
Maternal atopic dermatitis 16 (13.3) 1.95 (1.09–3.47) 14 (11.5) 1.30 (0.66–2.56)

AD, atopic dermatitis; aOR, adjusted odds ratio; CI, confidence interval.

Polychotomous logistic regression analysis was used to assess the relationship between atopic dermatitis severity and all the parameters.

OR was adjusted by age, sex, body mass index, districts and observers and its 95% CI of risk factors.

P<0.05

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