. 2016 Oct 11;46(10):942–951. doi: 10.1093/jjco/hyw091

Table 2.

Characteristics of case-control studies included in the meta-analysis

References	Study period	Study subjects				Exposure		Odds ratio ^a (95% CI)	Adjustment
References	Study period	Setting	Definition	Number of nonsmoking cases	Number of nonsmoking controls	Place/Source	Category	Odds ratio ^a (95% CI)	Adjustment
Akiba (24)		Hiroshima Nagasaki atomic bomb survivors cohort (nested case-control)	Case: Newly diagnosed cases of primary lung cancer	94 women	270 women	Spouse's smoking habit	Husband smoked	1.50 (0.87–2.59)	Year of birth, sex, city of residence, participation in biennial medical examination, vital statistics
Akiba (24)			Control: Cohort members without lung cancer	19 men	110 men	Spouse's smoking habit	Wife smoked	1.80 (0.43–7.59)
Inoue (26)	1980–83	Population-based, two cities in Kanagawa Prefecture	Case: Women lung cancer deaths	83 women	166 women	Husband ‘s smoking	<20 cigarettes/day	1.39 (0.26–7.50)	Age, year of deaths, district.
Inoue (26)	1973–81	Population-based, two cities in Kanagawa Prefecture	Control: Women cerebrovascular deaths	83 women	166 women	Husband ‘s smoking	≥20 cigarettes/day	3.09 (0.73–13.14)	Age, year of deaths, district.
Shimizu (34)	1982–85	Hospital-based, 4 hospitals in Nagoya City	Case: Female in-patients with lung cancer	90 women	163 women	The presence of a smoking family member	Husband	1.08 (0.64–1.82)	Age, hospital, date of admission.
Shimizu (34)	1982–85	Hospital-based, 4 hospitals in Nagoya City	Control: Female in-patients other than with lung cancer	90 women	163 women	The presence of a smoking family member	Husband	1.08 (0.64–1.82)	Age, hospital, date of admission.
Sobue (35)	1986–88	Hospital-based, 8 hospitals in Osaka Prefecture	Case: Newly-admitted patients in wards for lung cancer	144 women	731 women	Smoking status of household members	Husband smoked	1.13 (0.78–1.63)	Age, years of education
Sobue (35)	1986–88	Hospital-based, 8 hospitals in Osaka Prefecture	Control: Newly-admitted patients in one or two wards for other diseases.	144 women	731 women	Smoking status of household members	Husband smoked	1.13 (0.78–1.63)	Age, years of education
Seki (33)	1997–2009	Hospital-based, a hospital in Miyagi City	Case: Lung cancer patients	292 women	1810 women	Spouse's smoking habit	Husband smoked	1.31 (0.99–1.73)	Age, year of recruitment, area of residence, referral status (screening or not), occupation, alcohol drinking, family history of lung cancer
Seki (33)	1997–2009	Hospital-based, a hospital in Miyagi City	Control: Non-cancer patients	70 men	600 men	Spouse's smoking habit	Wife smoked	1.29 (0.34–4.90)

^aThe standard error and 95% CI were re-calculated from the reported odds ratios and CIs. Therefore, 95% CIs in this table do not always correspond to the CIs reported in each study.