Table 1.

Numbers of cases and controls included in analysis by study

Study Name	Geographic Location	Study Period	Controls	Cases	Serous	Mucinous	Endometrioid	Clear cell
Disease of the Ovary and their Evaluation Study ¹²	Washington	2002–2009	495	285	171	7	41	25
Hawaii Ovarian Cancer Study ¹¹	Hawaii	1994–2007	106	90	45	7	10	6
Hormones and Ovarian Cancer Prediction ^14a	Western Pennsylvania, Northeast Ohio, Western New York	2003–2008	594	253	167	8	26	17
New England Case-Control Study of Ovarian Cancer ¹³	New Hampshire, Eastern Massachusetts	1999–2008	362	286	183	16	47	16
University of Southern California, Study of Lifestyle and Women’s Health ^9a	Los Angeles, California	1993–2005	738	595	354	37	56	41
		Total:	2295	1509	920 ^b	75 ^b	180 ^b	105 ^b

Some of the study’s primary data were included in the Collaborative Group’s analysis ⁸.

Sum of numbers do not equal total number of cases because some cases were not classified as one of the four histotypes considered.