Table II.

The results of Newcastle–Ottawa Scale (NOS) [18] performed for 19 cohort studies

Author(s)	Cohort studies	Selection				Comparability	Outcome/exposure			Total of 9 scores
		1	2	3	4	(∗∗)	a	b	c
Alanio et al. [21]	Prospective cohort	∗	∗	∗	∗	N/A	∗	∗	∗	7
Bartoletti et al. [22]	Prospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9
Chauvet et al. [26]	Retrospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9
Delliere et al. [25]	Retrospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9
Dupont et al. [43]	Prospective cohort	∗	∗	∗	∗	N/A	∗	∗	∗	7
Gangneux et al. [15]	Prospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9
Helleberg et al. [60]	Retrospective cohort	∗	∗	∗	∗	N/A	∗	∗	∗	7
Koehler et al. [28]	Retrospective cohort	∗	∗	∗	∗	N/A	∗	∗	∗	7
Lahmer et al. [29]	Prospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9
Lamoth et al. [42]	Retrospective cohort	∗	∗	∗	∗	N/A	∗	∗	∗	7
Machado et al. [24]	Prospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9
Meijer et al. [61]	Retrospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9
Nasir et al. [19]	Retrospective cohort	∗	∗	∗	∗	N/A	∗	∗	∗	7
Roman-Montes et al. [27]	Retrospective cohort	∗	∗	∗	∗	∗	∗	∗	∗	8
Rutsaert et al. [20]	Retrospective cohort	∗	∗	∗	∗	N/A	∗	∗	∗	7
Van Arkel et al. [62]	Retrospective cohort	∗	∗	∗	∗	∗	∗	∗	∗	8
Van Biesen et al. [23]	Retrospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9
Velez Pintado et al. [63]	Retrospective cohort	∗	∗	∗	∗	∗	∗	∗	∗	8
Versyck et al. [64]	Retrospective cohort	∗	∗	∗	∗	∗∗	∗	∗	∗	9

1: Representatives of the exposed cohorts. 2: Selection of the non-exposed cohorts. 3: Ascertainment of exposure. 4: The outcome of interest was not present at the start of the study. a: Assessment of the outcome. b: Enough follow-up for the outcome. c: Adequacy of follow-up. N/A, non-available.