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. 2015 May 6;19(2):308–317. doi: 10.1017/S1368980015001263

Table 2.

Results of stratified analysis on the basis of study type, cancer site and sex

	Combined risk estimate			Test of heterogeneity			Publication bias
	Value	95 % CI	P	Q	I ² (%)	P	P (Egger test)	P (Begg test)	References
Study type
Case–control (n 7)	0·63	0·48, 0·82	0·001	28·68	75·59	0·0001	0·020	0·138	⁽ ²² ^– ²⁸ ⁾
Cohort (n 5)	1·04	0·93, 1·16	0·538	11·98	8·16	0·365	0·117	0·273	⁽ ²⁹ ^, ³⁰ ^, ³² ^, ³⁴ ^, ³⁵ ⁾
Supplement (n 4)	1·07	0·91, 1·26	0·417	12·47	27·82	0·188	0·634	0·655	⁽ ³¹ ^, ³³ ^– ³⁵ ⁾
Cancer site
Colon (n 6)	0·93	0·74, 1·16	0·515	27·72	71·14	0·001	0·026	0·022	⁽ ²³ ^, ²⁹ ^– ³² ^, ³⁵ ⁾
Rectal (n 3)	1·00	0·69, 1·45	0·989	8·53	41·37	0·129	0·061	0·015	⁽ ²² ^, ³¹ ^, ³⁵ ⁾
Colorectal (n 8)	0·91	0·76, 1·10	0·346	134·64	89·60	0·0001	0·004	0·299	⁽ ²⁴ ^– ²⁸ ^, ³³ ^– ³⁵ ⁾
Sex
F (n 6)	0·94	0·79, 1·12	0·510	22·19	54·94	0·014	0·005	0·102	⁽ ³ ^, ²² ^, ²⁴ ^, ³⁰ ^, ³² ^, ³⁴ ⁾
M (n 4)	1·02	0·89, 1·18	0·766	7·22	0·00	0·513	0·848	0·835	⁽ ²⁴ ^, ²⁹ ^, ³⁴ ^, ³⁵ ⁾
F+M (n 8)	0·85	0·66, 1·10	0·213	133·95	93·28	0·0001	0·020	0·655	⁽ ²³ ^, ²⁵ ^– ²⁸ ^, ³¹ ^, ³³ ^, ³⁴ ⁾

F, females; M, males.