Table 1 Prevalences of asthma symptoms by cooking method

Wheezing “ever” (n = 631*)

266 (42)

46 (37)

78 (38)

142 (47)

0.09

Wheezing in last 12 months (n = 627)

164 (26)

19 (15) ^a**

40 (20) ^ab

105 (35) ^b

<0.01

Diagnosed Asthma (n = 591)

108 (18)

20 (17)

34 (18)

54 (19)

0.87

Exercise-induced wheeze last year (n = 621)

89 (14)

9 (7)^a

17 (9)^a

63 (21)^b

<0.01

Nocturnal cough last year (n = 608)

163 (27)

29 (24)

50 (25)

84 (29)

0.51

Number of wheezing episodes last year (n = 626)

<0.01

 0

463 (74)

104 (85) ^a

163 (80) ^a

196 (65) ^b

 1-3

119 (19)

16 (13) ^a

37 (18) ^a

66 (22) ^a

 4-12

34 (5)

3 (2) ^ab

2 (1) ^b

29 (10) ^a

 More than 12

9 (1)

0 (0) ^a

1 (0) ^a

8 (3) ^a

Sleep disturbance due to wheezing last year (n = 620)

0.07

 Never

535 (86)

114 (94)

176 (88)

245 (82)

 Less than once a week

77 (12)

6 (5)

23 (12)

48 (16)

 Once or more than once a week

8 (1)

1 (1)

1 (1)

6 (2)