Table 1.

Distribution of variables according to wheezing during the last 12 months among children and unadjusted effects as odds ratios (OR) and 95% confidence intervals (CI).

Variables	Wheezing yes N (%)	Wheezing no N (%)	Odds ratios∗∗  95% CI
Mother's age at childbirth (years)
<30	110 (11.1%)	885 (88.9%)	1
31 and more	58 (11.7%)	436 (88.3%)	1.07 (0.75–1.52)
Maternal education level
Low (10 or less years)∗	52 (16.9%)	255 (83.1%)	1.87 (1.29–2.71)
Medium, high (>10 years)	116 (9.8%)	1066 (90.2%)	1
Socioeconomic status
Low	50 (12.5%)	351 (87.5%)	1.17 (0.81–1.69)
Moderate, high	118 (10.8%)	970 (89.2%)	1
Maternal smoking during pregnancy
No	150 (10.9%)	1226 (89.1%)	1
Yes	18 (15.9%)	95 (84.1%)	1.55 (0.88–2.71)
Maternal secondhand smoking
No	98 (10.3%)	858 (89.7%)	1
Yes	70 (13.1%)	463 (86.9%)	1.32 (0.94–1.86)
Gas cooking
No	52 (9.7%)	483 (90.3%)	1
Yes	116 (12.2%)	838 (87.8%)	1.29 (0.90–1.84)
Children's sex
Male∗	103 (14.0%)	635 (86.0%)	1.71 (1.22–2.41)
Female	65 (8.7%)	686 (91.3%)	1
Children parity
1	79 (9.6%)	743 (90.4%)	1
2 and more∗	89 (13.3%)	578 (86.7%)	1.45 (1.04–2.02)
Birth weight
<2500 g	14 (15.4%)	77 (84.6%)	1.47 (0.77–2.74)
2501 g and more	154 (11.0%)	1244 (89.0%)	1
Breastfeeding
No	16 (16.2%)	83 (83.8%)	1.57 (0.86–2.83)
Yes	152 (10.9%)	1238 (89.1%)	1
Allergy
No	61 (5.9%)	973 (94.1%)	1
Yes∗	107 (23.5%)	348 (76.5%)	4.90 (3.45–6.97)
Eczema
No	148 (10.7%)	1240 (89.3%)	1
Yes∗	20 (19.8%)	81 (80.2%)	2.07 (1.19–3.57)
Paracetamol use during the first year of life
No	41 (9.1%)	412 (90.9%)	1
Yes	127 (12.3%)	909 (87.7%)	1.40 (0.95–2.07)
Antibiotic use during the first year of life
No	75 (7.7%)	899 (92.3%)	1
Yes∗	93 (18.1%)	422 (81.9%)	2.64 (1.88–3.71)
Asthma in parents
No	140 (10.1%)	1251 (89.9%)	1
Yes∗	28 (28.6%)	70 (71.4%)	3.57 (2.17–5.87)

*P < 0.05.

∗∗Unadjusted associations are presented as wheezing odds ratio (OR) with 95% confidence intervals of univariate analysis.