Table 1. Characteristics of the eleven case-control studies included in the meta-analysis.

First author, Publication year	Country in which conducted	Study period	Age (years)	Study design	Cases/Controls	Proxy interview	Data-collection	Exposure variables and categories
Hochberg, 1990	USA	1977–1981	15–81	PCC	67/59	Yes	Questionnaire or phone interview	OC, Birth order, Mother’s age at birth, Age at menarche.
Cantor, 1993	USA	1984–1989	40–85	PCC	169/821	Yes	Questionnaire or phone interview	Age at first birth, Pregnancy, Parity, First-born.
Cicuttini, 1997	Australia	1987–1991	20–70	PCC	166/170	Yes	In-person interview	Pregnancy, Hysterectomy, Menopausal status.
Lambe, 1997	Swedish	1958–1990	≥15	NCC	1657/8225	NO	Data recorded in Fertility Registry and the Swedish Cancer Registry	Pregnancy, Number of births, Age at first birth.
Schlehofer, 1999	USA, Australia,France, Canada,Germany, Sweden	1980–1991	20–80	PCC	531/933	Yes	Questionnaire or in-person interview	Menopausal status, steroid hormones use.
Huang, 2004	USA	1995–1997	18–80	PCC	341/527	Yes	In-person interview	OC, HRT, Age at menarche, first birth and last birth, Number of live births, Breast Feeding, Menstruation months, Type of menopause.
Hatch, 2005	USA	1994–1998	≥15	HCC	212/436	Yes	Questionnaire or in-person interview	Age at menarche, first birth, and menopause, Ever pregnant, Ever had live birth, Number of live birth, Menopausal status, Type of menopause, Breast Feeding, Bilateral oophorectomy.
Wigertz, 2006	Sweden	2000–2002	20–69	PCC	115/323	Yes	In-person interview, phone interview, or questionnaire	OC, other contraceptives, HRT given gynecologic problems, HRT.
Wigertz, 2008	Sweden, Finland, Denmark, Norway,UK	2000–2004	18–69	PCC	626/1774	Yes	In-person interview or phone interview	Age at menarche and menopause, Pregnant, Menopausal status, Ever had live birth, No of pregnancies leading to a live birth, Breast feeding.
Felini, 2009	USA	1991–1994, 1997–1999, 2001–2004	≥20	PCC	619/650	Yes	In-person interview or phone interview	OC, PHT, Parity, number of children, Gravidity, Age at first birth and menopause, Menopausal type, Menstruation years.
Wang, 2011	USA	1993–2001	18–80	PCC/HCC	357/822	Yes	Questionnaire or in-person interview	OC, MRT, Age at menopause and menarche, Menopause status.

UK, United Kingdom; PCC, population-based case-control study; HCC, hospital-based case-control study; NCC, nested case-control study; PHT, postmenopausal hormone use; MRT, Menopausal hormone therapy use.