Table 2.

The methodological quality of the included studies (n = 13) on high-pressure balloon dilatation of primary obstructive megaureters

Study	Reporting	External validity	Internal validity bias	Internal validity confounding	Power	Total scores	Mean
Destro et al. [16]	8/7	3/3	4/4	1/0	0/0	16/14	15
García-Aparicio et al. [18]	8/6	3/3	4/3	1/0	0/0	16/12	14
Christman et al. [15]	7/6	3/3	3/3	1/0	0/0	14/12	13
Casal Beloy et al. [13]	8/8	3/3	3/2	0/0	0/0	14/13	13.5
Torino et al. [22]	9/7	3/3	4/2	1/0	0/0	17/12	14.5
Kassite et al. [19]	8/8	3/3	4/4	1/0	0/0	16/15	15.5
Romero et al. [21]	9/9	3/3	4/3	1/0	0/0	17/15	16
Angerri et al. [10]	8/5	3/3	3/2	1/0	0/0	15/10	12.5
Ortiz et al. [20]	8/8	3/3	4/3	1/1	0/0	16/15	15.5
Capozza et al. [12]	9/6	3/3	4/3	1/0	0/0	17/12	14.5
Faraj et al. [17]	9/9	3/3	4/3	1/0	0/0	17/15	16
Chiarenza et al. [14]	8/3	3/3	3/1	1/0	0/0	15/7	11
Bujons et al. [11]	9/8	3/3	4/3	1/0	0/0	17/14	15.5

The kappa value for the inter-observer agreement of the quality assessment was 0.8755