Comparison of Standard and Transepithelial Corneal Cross-Linking for the Treatment of Keratoconus: A Meta-analysis

Table 2

Risk of bias assessment based on the Newcastle-Ottawa Scale for nonrandomized studies.

Item		Akbar et al.	Jouve et al.	Kocak et al.	Madeira et al.	Vinciguerra et al.
Selection	Representativeness of the exposed cohort	1	1	1	1	1
	Selection of the nonexposed cohort	1	1	1	1	1
	Ascertainment of exposure to implants	1	1	1	1	1
	Demonstration that the outcome of interest was not present at the start of the study	0	1	0	0	1
Comparability	Comparability of cohorts on the basis of the design or analysis	1	2	2	2	1
Outcome	Ascertainment of outcome	1	1	1	1	1
	Followed up long enough for outcome to occur	1	1	1	1	1
	Adequacy of follow-up of cohort	1	1	1	1	1
Total score		7	9	8	8	8