Table 3.

All-Cause Mortality: Age-Specific HRs Relative to Nonsmokers by Smoking Severity, Adjusted for Race, Sex, and Antipsychotic Treatment

Age, y	Smoking Severity	HR	95% CI	χ2	P Value
<35	<1 ppd	1.82	0.71–4.69	1.54	.215
	≥1 ppd	0.45a	0.11–1.87	1.20	.272
	Unknown	1.83	0.65–5.11	1.32	.250
35–54	<1 ppd	1.05	0.55–1.99	0.02	.891
	≥1 ppd	2.66	1.71–4.16	18.62	<.001
	Unknown	2.08	1.23–3.53	7.49	.006
55–69	<1 ppd	0.51b	0.26–1.02	3.67	.056
	≥1 ppd	0.47c	0.25–0.90	5.24	.022
	Unknown	1.28	0.71–2.31	0.66	.418

Note: ppd, pack per day.

^aHazard ratio (HR) different from age 35–54 y (P = .020).

^bHR different from age <35 y (P = .033).

^cHR different from age 35–54 y (P < .001).