Prophylactic oophorectomy during primary colorectal cancer resection: A systematic review and meta-analysis

Table 1 Study characteristics

Ref.	Year	Study period	Setting	Design	Total patients	Patientsoophorectomy	Patients nooophorectomy	Mean age/yr (all)
Cai et al[14]	2004	1991-2000	Shanghai, China	Retrospective cohort	267	43	224	56.5
Sielezneff et al[15]	1997	1980-1990	Marseille, France	Prospective, non randomised	90	39	51	65
Tentes et al[16]	2004	1987-2002	Didimotichon Greece	Retrospective cohort	124	54	70	69
Young-Fadok et al[6]	1998	1986-1996	Mayo clinic, United States	RCT	146	74	72	67

RCT: Randomized controlled trial.