Table 3.

Newcastle-Ottawa Score for included studies

ID	Articles	Representativeness of exposed cohort	Selection of non-exposed cohort	Ascertainment of exposure	Demonstration outcome was not present at start of study	Study controls for important factor	Study controls for additional factors	Assessment of outcome	follow-up duration	Adequacy of follow-up	Overall Quality Score
		Selection				Comparability		Outcome
1	Adams et al.	*	*	*	*	*	–	*	*	–	7
2	Astrom et al.	*	*	*	*	*	–	*	*	–	7
3	Bernstein et al.	*	*	*	*	*	*	*	*	–	8
4	Biskupiak et al.	*	*	*	*	*	–	*	*	–	7
5	Bradford et al.	*	*	–	*	–	*	*	–	–	5
6	Cheung et al.	–	*	*	*	–	–	*	*	–	5
7	Coplan et al.	*	*	*	*	–	–	*	–	–	5
8	Dhawale et al.	–	*	*	*	–	–	*	*	*	6
9	Elmelund et al.	*	*	*	*	*	*	*	*	*	9
10	Fattah et al.	*	*	*	*	–	–	*	*	*	7
11	Fatti et al.	–	*	*	*	*	*	*	*	*	8
12	Flack et al.	–	*	*	*	*	–	*	*	–	6
13	Fong et al.	*	*	*	*	*	*	*	*	*	9
14	Gao et al.	*	*	*	*	*	–	*	*	*	8
15	Ghate et al.	*	*	*	*	*	*	*	–	–	7
16	Gofman et al.	*	*	*	*	*	*	*	*	*	9
17	Guelinckx et al.	–	*	*	–	–	–	*	*	–	4
18	Haas et al.	*	*	*	*	–	*	*	*	–	7
19	Heintzelman et al.	*	*	*	*	*	*	–	*	*	8
20	Henes et al.	–	*	–	*	–	–	–	*	–	3
21	Jehi et al.	*	*	–	*	*	*	–	–	–	5
22	Kharbanda et al.	*	*	*	*	*	*	*	*	–	8
23	Lasko et al.	*	*	*	*	*	–	*	*	–	7
24	Maahs et al.	*	*	*	*	*	*	*	*	–	8
25	Mahmud et al.	*	*	*	*	*	*	–	*	–	7
26	Mancevski et al.	*	*	*	*	*	*	*	*	*	9
27	McCoy et al.	*	*	*	*	*	*	*	*	*	9
28	Nannetti et al.	*	*	*	*	–	–	*	*	–	6
29	Pan et al.	*	*	*	*	*	*	*	*	*	9
30	Patterson et al.	*	*	*	*	*	*	*	*	*	9
31	Pirraglia et al.	*	*	*	*	*	*	*	*	–	8
32	Roth et al.	*	*	*	–	*	*	*	*	*	8
33	Ruiz et al.	*	*	*	*	*	*	*	*	–	8
34	Sarafoglou et al.	*	*	*	*	*	*	*	*	*	9
35	Schwartz et al.	*	*	*	*	*	*	*	*	–	8
36	Snijder et al.	*	*	–	*	*	*	*	*	–	7
37	Sy et al.	*	*	*	*	–	–	*	*	–	6
38	Tamayo et al.	*	*	*	*	*	*	*	*	–	8
39	Tanabe et al.	*	*	*	*	*	–	–	*	–	6
40	Ting et al.	–	*	*	–	*	*	*	*	*	7
41	Ullrich et al.	–	*	*	*	*	*	–	*	–	6
42	Walker et al.	*	*	*	–	*	*	–	*	–	6
43	Wong et al.	*	*	*	*	*	*	*	*	–	8
44	Zechmann et al.	*	*	*	*	–	–	*	*	–	6