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Table 2 Results of the Logistic Regression modelling according to selected risk factors

From: UK case control study of brain tumours in children, teenagers and young adults: a pilot study

  Cases Controls Odds ratio* 95% confidence interval
  n % n %   
Ever breastfed?
No 12 24.5 13 16.7 REF   
Yes 32 65.3 62 79.5 0.4 0.2 1.2
Missing 5 10.2 3 3.9    
Caesarean section?
No 33 67.4 63 80.8 REF   
Yes 11 22.5 11 14.1 1.6 0.6 4.4
Missing 5 10.2 4 5.1    
Birthweight (g)
<2500 2 4.1 3 3.9 1.5 0.2 11.9
2500-2999 4 8.2 12 15.4 1.0 0.2 4.0
3000-3499 11 22.5 30 38.5 REF   
3500-3999 16 32.7 16 20.5 2.9 1.0 8.2
4000+ 11 22.5 9 11.5 3.7 1.1 12.4
Missing 5 10.2 8 10.3    
Number of siblings
0 5 10.2 8 10.3 REF   
1 20 40.8 37 47.4 1.1 0.3 4.3
2 9 18.4 21 26.9 1.0 0.2 4.3
3+ 15 30.6 9 11.5 3.0 0.7 13.6
Missing 0 0.0 3 3.9    
Spoken on a mobile phone more than 20 times?
No 23 46.9 28 35.9 REF   
Yes 26 53.1 49 62.8 0.9 0.2 3.3
Missing 0 0.0 1 1.3    
Any animals kept at home?
No 11 22.5 14 17.9 REF   
Yes 38 77.5 62 79.5 1.0 0.3 2.9
Missing 0 0.0 2 2.6    
Regular contact with animals outside the home?
No 35 71.4 47 60.3 REF   
Yes 14 28.6 31 39.7 0.7 0.3 1.5
Missing 0 0.0 0 0.0    
  1. *Odds ratios calculated using conditional logistic regression stratified by age (5-year groups) and sex, analyses were adjusted for deprivation by the use of Townsend score quintiles based on the UK population distribution.
  2. REF, Reference category.