Table 3 Crude odds ratios (OR) and 95 % confidence intervals (CI) for current asthma, current rhinitis and current eczema

Raised on a farm

No

1

1

1

Yes

0.84 (0.48–1.45)

0.54 (0.38–0.78)

0.45 (0.24–0.85)

Number of siblings

0

1

1

1

1

3.06 (1.29–7.25)

1.37 (0.92–2.06)

0.76 (0.45–1.29)

2 or more

2.76 (1.17–6.49)

1.32 (0.89–1.97)

0.59 (0.35–0.99)

Childhood daycare

No

1

1

1

Yes

1.14 (0.80–1.63)

1.40 (1.11–1.77)

1.48 (1.06–2.07)

Childhood smoke exposure

No

1

1

1

Yes

1.05 (0.73–1.50)

0.91 (0.72–1.15)

1.52 (1.06–2.16)

Maternal smoking in pregnancy

No

1

1

1

Yes

0.70 (0.35–1.37)

1.04 (0.70–1.54)

1.89 (1.13–3.14)

Furry animals in childhood

Yes

1

1

1

No

1.19 (0.83–1.70)

1.05 (0.75–1.49)

1.24 (0.98–1.57)

Childhood airway infection

No

1

1

1

Yes

2.35 (1.57–3.51)

0.94 (0.73–1.23)

1.34 (0.92–1.94)

Shared bedroom in childhood

No

1

1

1

Yes

1.22 (0.85–1.76)

0.91 (0.72–1.16)

0.99 (0.70–1.39)

Birth weight

3000–4000 g

1

1

1

Less than 2500 g

2.00 (0.89–4.50)

1.22 (0.65–2.31)

0.96 (0.39–2.35)

2500–3000 g

1.41 (0.81–2.45)

1.04 (0.71–1.52)

1.21 (0.73–1.99)

More than 4000 g

0.72 (0.36–1.44)

0.89 (0.60–1.31)

0.54 (0.28–1.04)

Level of education

Secondary school or less

1

1

1

High school

1.00 (0.59–1.67)

1.10 (0.79–1.54)

1.49 (0.91–2.43)

University

1.09 (0.67–1.78)

1.15 (0.84–1.58)

1.13 (0.69–1.84)