Table 1. Studies include in meta-analysis of physical activity and colon polyps.

Author and Year	Gender	Number of study subjects	Number of Cases	Relative Risk	Lower Confidence Interval	Upper Confidence Interval	Type of Physical Activity	Case definition	Non-case/ comparison definition
Kono et al, 1991	Both	1148	80	0.44	0.22	0.87	Leisure	Adenoma	None
Little et al, 1993	Both	300	147	0.46	0.17	1.29	Leisure	Adenoma	FOBT negative
Shinchi et al, 1994	Both	1712	228	1.2	0.8	2	Leisure	Adenoma	None
Giovannucci et al, 1995	Men	12 879	455	0.79	0.57	1.09	Leisure	Distal Adenoma	No polyp
Sandler, 1995	Men	234	86	0.92	0.36	2.31	Leisure	Adenoma	Hyperplastic/none
Sandler, 1995	Women	350	114	0.64	0.35	1.19	Leisure	Adenoma	Hyperplastic/none
Giovannucci et al, 1996	Women	13 057	330	0.58	0.4	0.86	Leisure	Distal Adenoma	None
Neugut, 1996	Men	400	225	0.6	0.4	1	Total	Adenoma	None
Neugut, 1996	Women	411	283	1.3	0.7	2.3	Total	Adenoma	None
Enger et al, 1997	Both	920	460	1	0.7	1.5	Total	Adenoma	No polyp
Lubin et al, 1997	Both	392	196	0.6	0.3	0.9	Total	Large/advanced Adenoma	Hyperplastic/None
Kahn et al, 1998	Men	72 868	7504	0.83	0.76	0.91	Total	All polyps	None
Kahn et al, 1998	Women	81 356	5111	0.9	0.78	1.03	Total	All polyps	None
Kono et al, 1999	Both	415	189	0.6	0.3	1.3	Leisure	Adenoma	Normal
Boutron-Ruault et al, 2001	Both	581	154	1.3	0.7	2.5	Total	Small adenoma	None
Boutron-Ruault et al, 2001	Both	635	208	0.8	0.4	1.5	Total	Large/advanced adenoma	None
Colbert et al, 2002	Both	1839	733	1.2	0.9	1.6	Total	Adenoma or cancer	None
Lieberman et al, 2003	Both	2082	312	0.94	0.86	1.02	Total	Large/advanced adenoma	None
Tiemersma et al, 2003	Women	471	196	1.05	0.72	1.54	Not specified	Adenoma	None
Tiemersma et al, 2003	Men	398	237	0.69	0.43	1.1	Not specified	Adenoma	None
Hauret et al, 2004	Both	405	177	0.63	0.34	1.17	Total	Adenoma	Hyperplastic/None
Wallace et al, 2005	Men	787	539	0.35	0.17	0.72	Total	Large/advanced adenoma	None
Wallace et al, 2005	Women	787	205	1.21	0.36	4.03	Total	Large/advanced adenoma	None
Larsen et al, 2006	Both	3696	426	0.96	0.74	1.25	Total	Low risk adenoma	None
Larsen et al, 2006	Both	3376	106	0.56	0.34	0.92	Total	Large/advanced adenoma or cancer	None
Rosenberg et al, 2006	Women	45 400	1390	0.72	0.57	0.91	Leisure	All polyps	None
Hermann et al, 2009	Both	4510	527	1.02	0.74	1.42	Total	Adenoma	None

Abbreviation: FOBT=Fecal occult blood test.