|
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
|
1.39
|
0.77–2.52
|
1.31
|
0.72–2.40
|
0.75
|
0.3–1.54
|
|
Age
|
|
14 years (ref)
|
1
| |
1
| |
1
| |
|
15 years
|
1.05
|
0.58–1.89
|
1.21
|
0.66–2.23
|
1.43
|
0.71–2.87
|
|
Ethnicity
|
|
Non- Sinhalese (ref)
|
1
| |
1
| |
1
| |
|
Sinhalese
|
1.52
|
0.72–3.21
|
1.54
|
0.72–3.29
|
1.14
|
0.48–2.69
|
|
Employment status of father
|
|
Employed (ref)
|
1
| |
1
| |
1
| |
|
Unemployed
|
0.65
|
0.14–2.98
|
0.59
|
0.13–2.74
|
0.33
|
0.05–1.99
|
|
Employment status of mother
|
|
Employed (ref)
|
1
| |
1
| |
1
| |
|
Unemployed
|
2.26**
|
1.21–4.22
|
2.32**
|
1.22–4.38
|
3.13***
|
1.51–6.47
|
|
Presence of smokers in household
|
|
Not present (ref)
|
1
| |
1
| |
1
| |
|
Present
|
7.60****
|
3.84–15.03
|
8.25****
|
3.99–17.04
|
11.04****
|
4.97–24.52
|
- Model 1: Univariable analysis
- Model 2: Multivariable with age, sex and ethnicity (ORs presented for age, sex and ethnicity come from models including those variables only)
- Model 3: Multivariable, including all variables
- Significance level **p < 0.01, ***p < 0.005, ****p < 0.001,
- OR odds ratio, CI Confidence Interval
