Selection				Comparability		Outcome
Study	A representative of the exposed cohort	Selection of nonexposed cohort	Ascertainment of exposure	Demonstration that the outcome of interest was not present at the start of the study	Adjust for the most critical risk factors	Adjust for other risk factors	Assessment of outcome	Follow-up length	The loss to follow-up rate	Total
21	1	1	0	1	1	1	1	1	1	8
22	1	0	1	0	1	1	1	1	1	7
23	1	1	1	1	1	1	1	1	1	9
26	1	1	1	1	0	1	1	1	1	8
27	1	1	1	1	1	0	1	1	1	7
28	1	1	1	0	1	1	1	1	1	8
29	1	1	1	1	1	1	1	1	1	9
30	1	1	1	0	1	0	1	1	1	7
31	1	1	1	1	1	1	1	1	1	9
33	1	1	1	1	1	1	1	0	1	8
32	1	1	1	1	1	1	1	1	1	9
34	1	1	1	1	1	1	1	1	1	9
35	1	1	1	1	0	0	1	1	1	7
36	1	1	1	1	1	1	1	1	1	9
24	1	1	1	1	1	1	1	1	1	9
40	1	1	1	1	0	1	1	1	1	8
41	1	1	1	1	1	1	1	1	0	8
37	1	1	1	1	1	1	1	1	1	9
38	1	1	1	1	1	1	1	1	1	9
42	1	1	1	1	1	1	1	1	1	9
43	1	1	1	0	1	0	1	1	1	7
44	1	1	1	1	1	1	1	0	1	8
45	1	0	1	1	1	0	1	1	1	7
39	1	1	1	1	1	1	1	1	1	9