Table 3.

Summary risk estimates from subgroup analyses

		N. estimates	SRR	Low	Up	P
Study design	CC	7	0.48	0.29	0.81	0.20
	NCC and CO	7	0.88	0.73	1.07
Assay method	ELISA	7	0.58	0.32	1.03	0.76
	No	6	0.82	0.65	1.03
Risk estimate adjustmentsa	For menopausal status	6	0.61	0.35	1.06	0.72
	No	3	0.62	0.15	2.57

SRR, summary relative risk; CC, case-control; NCC, nested case-control; CO, cohort; ELISA, enzyme-linked immunosorbent assay.

^aAdjustments or matching; risk adjustment for menopausal status was evaluated for studies including pre- and post-menopausal women.