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Table 2 Areas of methodological quality recommended to be assessed in reviews by Cochrane Review Groups. Values are numbers (percentages)

From: Recommendations by Cochrane Review Groups for assessment of the risk of bias in studies

Area of quality recommended All (n = 50) Components (n = 41) Scales (n = 9)
Sequence generation 35 (70) 26 (63) 9 (100)
Concealment of allocation 43 (86) 41 (100) 2 (22)
Blinding of patients 42 (84) 33 (80) 9 (100)
Blinding of caregivers 33 (66) 32 (78) 1 (11)
Blinding of outcome assessors 48 (96) 39 (95) 9 (100)
Follow-up 47 (94) 38 (93) 9 (100)
Intention-to-treat analysis 21 (42) 20 (49) 1 (11)