Table 6. Relationship between the duration of sun exposure in recent spring, summer, and autumn and prevalence of allergic diseases.
| Duration of sunlight exposure per week | Symptom, ever | Symptom, recent 1 yr | Diagnosis, ever | Treatment, recent 1 yr | ||||
|---|---|---|---|---|---|---|---|---|
| aOR† (95% CI) | P value | aOR† (95% CI) | P value | aOR† (95% CI) | P value | aOR† (95% CI) | P value | |
| Asthma* | 0.85 (0.65–1.11) | 0.223 | 0.82 (0.48–1.4) | 0.476 | 0.82 (0.59–1.15) | 0.259 | 0.79 (0.47–1.34) | 0.380 |
| Allergic rhinitis* | 0.9 (0.75–1.1) | 0.304 | 0.86 (0.55–1.36) | 0.527 | 1.05 (0.86–1.29) | 0.616 | 1.18 (0.95–1.47) | 0.128 |
| Atopic dermatitis* | 0.86 (0.69–1.07) | 0.174 | 1.19 (0.8–1.76) | 0.392 | 0.97 (0.79–1.18) | 0.762 | 1.06 (0.81–1.4) | 0.661 |
| Food allergy* | 0.84 (0.66–1.08) | 0.176 | 0.7 (0.46–1.06) | 0.090 | 1.23 (0.83–1.83) | 0.304 | 1.01 (0.53–1.93) | 0.980 |
Parent's allergic disease includes asthma, allergic rhinitis, atopic dermatitis, and food allergy.
Autumn, March to November; aOR, adjusted odds ratio; CI, confidence interval.
*<2 hours (reference: ≥2 hours). †Odds ratios are calculated with adjustment by sex, age, body mass index, type of delivery, use of antibiotics before the age of 12 months, duration of breast feeding, and parental history of allergic diseases.