Table 2.

Characterstics of excluded studies that contain only RR of colorectal cancer

Author, year (ref. no.), country	Study design	RR (95% CI), sex
Levi et al., 2002 (55), Switzerkand	Case–control study	1.3 (0.63–2.68), m 3.56 (1.05–12.11), w
Kune et al., 2007 (56), Australia	Case–control study	1.28 (0.67–2.47), m 0.75 (0.35–1.61), w
Seow et al., 2006 (57), Singapore	Cohort study based on incidence rate	1.5 (1.2–2.1), m 1.4 (1.0–1.9), w
Jee et al., 2005 (58), Korea	Cohort study based on incidence rate	1.11 (1.0–2.4), m 1.17 (0.98–1.4), w
Khaw et al., 2004 (59), UK	Cohort study based on incidence rate	3.37 (1.17–9.72), m 1.71 (0.23–12.64), w
Nielsen and Vatten, 2001 (60), Norway	Cohort study based on incidence rate	0.66 (0.35–1.24), m 1.55 (1.04–2.31), w
Schoen et al., 1999 (61), USA	Cohort study based on incidence rate	1.6 (0.8–3.1), m 1.1 (0.5–2.6), w
Will et al., 1998 (26), USA	Cohort study based on incidence rate	1.3 (1.03–1.65), m 1.16 (0.87–1.53), w
Steenland et al., 1995 (62), USA	Cohort study based on incidence rate	1.43 (0.61–3.31), m 1.4 (0.64–3.1), w
Zendehdel et al., 2003 (63), Sweden	Cohort study based on standardized incidence ratio	1.1 (0.6–1.7), m + w
Stürmer et al., 2006 (64), USA	Cohort study based on hazard ratio	1.5 (1.1–2.0), m

CI, confidence interval; m, men; RR, relative risk; w, women.