Table 3.

Modified Down and Black scale scores for the included studies and inter-observer agreement (kappa statistics).

Study ID	Rater I	Rater 2	Kappa statistics
Guinot et al. [16]	17	16	0.97
Mahmoud et al. [22]	22	21
Eryilmaz et al. [21]	19	17
Elsayem et al. [23]	27	23