Table 3

 Association between variables at birth, first year of life, socioeconomic factors and smoking and wheeze and waking with breathlessness at night by polytomous regression analysis (n = 1062)*

Wheeze†OR (95% CI), p valueWaking with breathlessness†OR (95% CI), p valueTwo symptoms combined OR (95% CI), p value
OR, odds ratio; BMI, body mass index.
*Each assessment was adjusted for all the variables in the table.
†Asthma symptoms in the last 12 months.
Sex (female)1.25 (0.89 to 1.75), 0.1912.10 (1.20 to 3.71), 0.0101.61 (0.93 to 2.77), 0.087
No of siblings0.99 (0.91 to 1.07), 0.7551.05 (0.94 to 1.17), 0.4071.12 (1.00 to 1.24), 0.044
Birth weight (100 g)0.95 (0.89 to 1.01), 0.1100.94 (0.85 to 1.05), 0.2821.08 (0.97 to 1.21), 0.158
Weight gain in first year (g/month)1.004 (1.001 to 1.007), 0.0111.001(0.996 to 1.006), 0.6901.004 (0.999 to 1.008), 0.141
BMI at birth (kg/m2)1.02 (0.78 to 1.32), 0.8880.87 (0.58 to 1.31), 0.5010.54 (0.35 to 0.84), 0.007
BMI gain in first year (kg/(m2 month))0.20 (0.03 to 1.40), 0.1050.20 (0.01 to 4.74), 0.3180.18 (0.01 to 4.34), 0.290
Smoking status2.24 (1.59 to 3.16), <0.0011.27 (0.76 to 2.10), 0.3582.07 (1.20 to 3.56), 0.009
Car ownership1.00 (0.69 to 1.44), 0.9880.74 (0.39 to 1.38), 0.3360.43 (0.20 to 0.90), 0.025
Length of pregnancy
    <37 weeks0.71 (0.41 to 1.25), 0.2410.55 (0.22 to 1.41), 0.2150.57 (0.22 to 1.45), 0.238
    Not known0.77 (0.54 to 1.09), 0.1400.70 (0.40 to 1.22), 0.2060.83 (0.48 to 1.44), 0.509
Duration of breast feeding
    ⩽1 month0.64 (0.43 to 0.94), 0.0230.58 (0.31 to 1.09), 0.0880.94 (0.52 to 1.70), 0.834
    Not known0.86 (0.49 to 1.49), 0.5831.03 (0.46 to 2.30), 0.9381.68 (0.81 to 3.52), 0.166
No of household belongings0.94 (0.79 to 1.12), 0.4690.98 (0.75 to 1.29), 0.9040.86 (0.66 to 1.13), 0.280
Adult BMI (kg/m2)1.03 (0.99 to 1.06), 0.1691.04 (0.98 to 1.10), 0.1751.04 (0.98 to 1.10), 0.221