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Table 1 Comparison of background factors between cases and controls.

From: Clinically diagnosed childhood asthma and follow-up of symptoms in a Swedish case control study

 

Case (n = 158)

Control (n = 171)

 
 

n

%

n

%

p-value

Gender

     

Male

102

64.5

107

62.5

 

Female

56

35.4

64

37.4

0.71

Having older siblings

99

62.6

108

63.1

0.37

Having younger siblings

92

58.2

93

54.3

0.45

Social class of father

     

1

21

13.2

20

11.7

0.85

2

51

32.2

57

33.3

 

3

75

47.5

87

50.8

 

Social class of mother

     

1

8

5.0

7

4.0

0.35

2

69

43.6

62

36.2

 

3

81

51.2

100

58.4

 

Living conditions during the child's first 3 years

   Countryside

61

38.6

79

46.2

0.16

City

92

58.2

92

53.8

 

Mixed

5

3.2

0

0.0

 

Villa/house

102

64.5

116

67.8

0.46

Apartment

53

33.5

49

28.6

 

Mixed

3

1.8

6

3.5

 

Living conditions at the age of 10

   Countryside

71

44.9

89

52.0

0.16

   City

83

52.5

82

47.9

 

   Mixed

4

2.5

0

0.0

 

   Villa /house

118

74.7

135

78.9

0.29

   Apartment

36

22.7

35

20.4

 

   Mixed

4

2.5

1

0.5

 

Smoking habits of father

   Non-smoker

117

74.1

140

81.8

0.22

   Smokes 0–9 cig/day

13

8.2

15

8.8

 

   Smokes 10–20 cig/day

19

12.0

11

6.4

 

   Smokes >20 Cig /day 2

1.3

5

2.9

  

Smoking habits of mother

   Non-smoker

105

66.4

136

79.5

0.007

   Smokes 0–9 cig/day

24

15.2

13

7.6

 

   Smokes 10–20 cig/day

27

17.1

20

11.7

 

   Smokes >20 Cig /day

2

1.3

2

1.2

 

Smoking habits of other members of the household

   Non-smoker

152

96.2

164

95.9

0.34

   Smokes 0–9 cig/day:

4

2.5

6

3.5

 

   Smokes 10–20 cig/day:

0

0.0

1

0.5

 

   Smokes >20 Cig /day

2

1.2

0

0.0

 

Smoking at home during the first 3 years

   No:

128

81.0

143

83.6

0.53

   Yes:

30

18.9

28

16.3