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Table 2 study quality according to the Downs and Black instrument for success and complications

From: Surgical approaches for treatment of ureteropelvic junction obstruction – a systematic review and network meta-analysis

 Baldwin et al. [25]Bernie et al. [26]Bird et al. [27]Brooks et al. [28]Calvert et al. [29]Chen et al. [30]Danuser et al. [31]Desai et al. [14]Fahad [32]Garcia-Galisteo et al. [33]Han et al. [22]Hanske et al. [20]Hemal et al. [34]Klingler et al. [35]Link et al. [36]Lucas et al. [16]Memon et al. [37]Mohammed [38]Olweny et al. [39]Pahwa et al. [40]Rivas et al. [15]Simforoosh et al. [41]Umari et al. [42]Wang et al. [43]Weise and Winfield [44]Yanke et al. [21]
Success
 Hypothesis/aim/objective clearly described11111110111NA11NA11111011111
 Main outcomes in Introduction or Methods00111101001NA01NA11111111111
 Patient characteristics clearly described00111101011NA11NA01010101111
 Interventions of interest clearly described10100101111NA11NA10010100011
 Principal confounders clearly described00100000000NA00NA11000101012
 Main findings clearly described10111111111NA00NA11111111111
 Estimates of random variability provided for main outcomes00101111001NA11NA10110100101
 All adverse events of intervention reported10110101110NA11NA01001111010
 Characteristics of patients lost to follow-up described00000000000NA00NA10000001100
 Probability values reported for main outcomes11110000000NA00NA10000000101
 Subjects asked to participate were representative of source population00000100110NA11NA11011101011
 Subjects prepared to participate were representative of source population00001100110NA11NA10011111111
 Location and delivery of study treatment was representative of source population11111110111NA11NA11111111111
 Study participants blinded to treatment00000000000NA00NA00000000000
 Blinded outcome assessment00000000000NA00NA00000000000
 Any data dredging clearly described00000000000NA00NA10000100000
 Analyses adjust for differing lengths of follow-up00000000000NA00NA10100000001
 Appropriate statistical tests performed10101001011NA00NA10010110111
 Compliance with interventions was reliable00000000000NA11NA11111111111
 Outcome measures were reliable and valid10101000011NA00NA11010101111
 All participants recruited from the same source population11110110111NA11NA11111101111
 All participants recruited over the same time period11110000101NA01NA01100011101
 Participants randomized to treatment(s)00000000000NA00NA00100000000
 Allocation of treatment concealed from investigators and participants00000000000NA00NA00000100000
 Adequate adjustment for confounding00000000000NA00NA00000000001
 Losses to follow-up taken into account00000000000NA00NA10000000001
 Study power21534542233NA43NA54324443535
Sum1261912131699111414NA1415NA2316131513201317191725
Complications
 Hypothesis/aim/objective clearly described11111110111111111NA11011111
 Main outcomes in Introduction or Methods00111101001101011NA11111111
 Patient characteristics clearly described00111101011111101NA10101111
 Interventions of interest clearly described10100101111011010NA10100011
 Principal confounders clearly described00100000000200111NA00101012
 Main findings clearly described10111111111100111NA11111111
 Estimates of random variability provided for main outcomes00101111001111110NA10100101
 All adverse events of intervention reported10110101110111001NA01111010
 Characteristics of patients lost to follow-up described00000000000000010NA00001100
 Probability values reported for main outcomes11110000000100010NA00000101
 Subjects asked to participate were representative of source population00000100110111111NA11101011
 Subjects prepared to participate were representative of source population00001100110111110NA11111111
 Location and delivery of study treatment was representative of source population11111110111111011NA11111111
 Study participants blinded to treatment00000000000000000NA00000000
 Blinded outcome assessment00000000000000000NA00000000
 Any data dredging clearly described00000000000000010NA00100000
 Analyses adjust for differing lengths of follow-up00000000000000010NA00000001
 Appropriate statistical tests performed10101001011100010NA10110111
 Compliance with interventions was reliable00000000000111111NA11111111
 Outcome measures were reliable and valid10101000011100111NA10101111
 All participants recruited from the same source population11110110111111111NA11101111
 All participants recruited over the same time period11110000101101101NA00011101
 Participants randomized to treatment(s)00000000000000000NA00000000
 Allocation of treatment concealed from investigators and participants00000000000000000NA00100000
 Adequate adjustment for confounding00000000000100000NA00000001
 Losses to follow-up taken into account00000000000000010NA00000001
 Study power21534542233543154NA24443535
Sum1261912131699111414231415122316NA1513201317191725
  1. NA not applicable