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Table 4 Odds ratios from logistic regression, with 95% confidence intervals, on the odds of exposure to second hand smoke in public places for socioeconomic and individual factors amongst schoolchildren, Hanwella, Colombo, Sri Lanka

From: Prevalence and correlates of exposure to second hand smoke (SHS) among 14 to 15 year old schoolchildren in a medical officer of health area in Sri Lanka

Factors Model 1 OR Univariate 95% CI Model 2 OR (+Age Sex Ethnicity) 95% CI Model 3 OR (All factors) 95% CI
Sex
 Male (ref) 1   1   1  
 Female 1.32 0.79–2.20 1.41 0.83–2.38 1.12 0.63–1.98
Age
 14 years (ref) 1   1   1  
 15 years 1.31 0.78–2.19 1.21 0.71–2.05 1.38 0.78–2.41
Ethnicity
 Sinhalese (ref) 1   1   1  
 Non-Sinhalese 1.88* 1.08–3.29 1.76 0.98–3.13 2.34** 1.26–4.36
Employment status of father
 Employed (ref) 1   1   1  
 Unemployed 1.32 0.44–3.93 1.51 0.49–4.65 1.52 0.46–4.96
Employment status of mother
 Employed (ref) 1   1   1  
 Unemployed 1.77 1.00–3.12 1.83* 1.02–3.29 2.01* 1.09–3.67
Presence of smokers in household
 Not present (ref) 1   1   1  
 Present 2.57*** 1.35–4.91 2.75*** 1.39–5.42 2.52** 1.24–5.10
  1. Model 1: Univariable analysis
  2. Model 2: Multivariable with age, sex and ethnicity (ORs presented for age, sex and ethnicity come from models including those variables only)
  3. Model 3: Multivariable, including all variables
  4. Significance level *p < 0.05, **p < 0.01, ***p < 0.005
  5. OR odds ratio, CI Confidence Interval