Table 1.

The effect of researcher distributing questionnaires, age, sex and availability of health promotion payment within SIS on recording of smoking advice in patient's medical records (from a multi-level logistic regression model)

	Odds ratio (95% CI)
Researcher distributing questionnaires
No	1
Yes	1.78 (1.36 to 2.34)
Males	1
Female	1.16 (0.91 to 1.48)
Age (in quartiles)
0 to 24	1
24 to 40	2.79 (1.98 to 3.94)
40 to 59	2.12 (1.48 to 3.04)
59 to 93	1.19 (0.80 to 1.78)
Payment available in SIS study
No	1
Yes	0.90 (0.68 to 1.18)