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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