Table 2 Factors may relate to asthma

 Asthma in parents

10.1 (67/665)

1.7 (11/665)

<0.001

 Preterm birth

9.5 (31/326)

7.1 (46/644)

0.101

 Caesarean birth

62.6 (201/321)

45.7 (297/650)

<0.001

 Complications during pregnancy

23.6 (109/461)

14.0 (64/458)

<0.001

 Infections during pregnancy

2.8 (13/462)

0.9 (4/458)

0.057

 Exclusive breastfeeding

51.2 (166/324)

63.2 (405/641)

0.002

 Hospitalization during neonatal

14.0 (65/463)

12.9 (59/458)

0.634

 Drug allergy

51.9 (136/262)

10.3 (68/658)

<0.001

 Food allergy

13.6 (53/389)

6.5 (43/663)

0.001

 Atopic dermatitis

37.1 (93/251)

4.3 (28/658)

<0.001

 Allergic rhinitis

79.0 (319/404)

11.2 (74/658)

<0.001

 Sinusitis

26.2 (56/214)

4.6 (30/657)

<0.001

 Adenoidal hypertrophy

40.6 (99/244)

2.9 (19/657)

<0.001

 Urticaria

47.5 (135/284)

9.6 (63/658)

<0.001

 Renovation works in the home after child’s birth

47.7 (155/325)

35.8 (224/626)

0.060

 Carpet using

8.4 (27/322)

6.8 (43/632)

0.551

 House plants

44.7 (144/322)

46.0 (294/639)

0.335

House animals

9.2 (30/325)

15.0 (97/647)

0.013