Table 3.

Risk of all and cause-specific mortality among 4121 women recruited in Scotland to the RCGP Oral Contraception Study

Cause of death^b	Number of cigarettes smoked daily at recruitment	Unadjusted		Adjusted^a

		HR	95% CI	HR	95% CI
All causes	<15	2.01	1.65 to 2.44	1.99	1.74 to 2.27
	≥15	2.97	2.46 to 3.59	2.81	2.47 to 3.20
	History of serious illness^c			1.73	1.54 to 1.95
	Contraceptive pill use status^c			0.78	0.69 to 0.87
	Parity^c			0.90	0.82 to 0.98
	Social class			0.80	0.71 to 0.91
	Age			1.07	1.06 to 1.08

Any cancers	<15	2.02	1.52 to 2.69	1.95	1.61 to 2.36
Any cancers	≥15	2.71	2.04 to 3.60	2.51	2.08 to 3.05

Circulatory disease	<15	2.16	1.51 to 3.08	2.24	1.75 to 2.87
Circulatory disease	≥15	3.05	2.15 to 4.33	2.87	2.25 to 3.68

Respiratory disease	<15	1.90	0.82 to 4.37	1.71	0.90 to 3.23
Respiratory disease	≥15	7.49	3.78 to 14.8	8.18	4.95 to 13.5

Other causes not specified	<15	1.80	1.15 to 2.80	1.81	1.32 to 2.49
Other causes not specified	≥15	2.23	1.42 to 3.51	2.19	1.58 to 3.03

HR = hazard ratio.
↵a Adjusted for age and social class at recruitment and history of serious illness, contraceptive pill use status, and parity.
↵b The number of deaths in each category is shown in Table 2.
↵c Entered as a time-dependent covariate.