Table 6

 Association between variables at birth, socioeconomic factors, and smoking and BHR and atopy by polytomous regression analysis (n = 1213)*

Atopy OR (95% CI), p valuePositive BHR OR (95% CI), p valueAtopy and positive BHR combined OR (95% CI), p value
OR, odds ratio; BMI, body mass index; BHR, bronchial hyperresponsiveness.
*Each assessment was adjusted for all the variables in the table.
Sex (females)0.82 (0.61 to 1.09), 0.1622.01 (1.25 to 3.23), 0.0043.01 (1.63 to 5.54), <0.001
No of siblings0.95 (0.89 to 1.01), 0.0990.98 (0.89 to 1.08), 0.6210.88 (0.77 to 1.01), 0.066
Birth weight (100 g)1.02 (0.96 to 1.08), 0.5591.03 (0.94 to 1.13), 0.4760.94 (0.85 to 1.05), 0.267
BMI at birth (kg/m2)1.03 (0.83 to 1.27), 0.7960.95 (0.68 to 1.32), 0.7591.02 (0.70 to 1.47), 0.921
Smoking status1.06 (0.80 to 1.41), 0.6841.59 (0.99 to 2.54), 0.0531.26 (0.74 to 2.14), 0.404
Car ownership1.01 (0.73 to 1.39), 0.9650.45 (0.24 to 0.84), 0.0110.76 (0.40 to 1.44), 0.394
Length of pregnancy
    <37 weeks0.62 (0.36 to 1.08), 0.0911.24 (0.61 to 2.51), 0.5510.91 (0.39 to 2.13), 0.825
    Not known1.13 (0.84 to 1.52), 0.4280.93 (0.56 to 1.53), 0.7641.09 (0.61 to 1.94), 0.781
Duration of breast feeding
    ⩽1 month0.98 (0.70 to 1.35), 0.8830.80 (0.46 to 1.39), 0.4281.29 (0.73 to 2.28), 0.385
    Not known0.87 (0.55 to 1.40), 0.5751.33 (0.70 to 2.52), 0.3810.79 (0.30 to 2.07), 0.625
No of household belongings0.95 (0.81 to 1.10), 0.4780.99 (0.78 to 1.26), 0.9611.03 (0.77 to 1.38), 0.845
Adult BMI (kg/m2)1.03 (1.00 to 1.06), 0.0940.94 (0.89 to 0.99), 0.0280.96 (0.90 to 1.02), 0.161