Table 3.

Relative Risk of Non-Hodgkin Lymphoma According to Household Passive Smoking Exposure Among Never Smokers, California Teachers Study, 1995–2007^a

Household Passive Smoking Characteristic	Person-Years	Non-Hodgkin Lymphoma			Diffuse Large B-Cell Lymphoma			Follicular Lymphoma			Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma
		No. of Cases	RR	95% CI	No. of Cases	RR	95% CI	No. of Cases	RR	95% CI	No. of Cases	RR	95% CI
Never smokers with no passive smoking exposure	255,211	87	1.00	Referent	27	1.00	Referent	14	1.00	Referent	17	1.00	Referent
Never smokers with passive smoking exposure	618,868	284	1.15	0.90, 1.46	66	0.92	0.58, 1.44	64	1.66	0.93, 2.98	52	0.93	0.54, 1.62
Childhood passive smoking exposure only	280,155	91	1.07	0.80, 1.44	21	0.86	0.48, 1.54	19	1.38	0.69, 2.76	16	0.93	0.47, 1.85
Adulthood passive smoking exposure only	124,527	76	1.18	0.86, 1.61	20	1.02	0.57, 1.84	15	1.58	0.76, 3.31	14	0.92	0.45, 1.87
Both childhood and adulthood passive smoking exposure	204,464	115	1.23	0.93, 1.63	25	0.93	0.53, 1.61	29	2.02	1.06, 3.87	22	0.99	0.52, 1.88

Abbreviations: CI, confidence interval; RR, relative risk.

^aAll models were stratified by age at cohort entry and adjusted for race (non-Hispanic white or other) and alcohol consumption 1 year before cohort entry (0 g/day, <15 g/day, ≥15 g/day, or unknown). The analyses were restricted to 79,006 never smokers.