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Table 3 The distribution of the weighted means of the trial arms of the primary outcome in percentage points of the best value in the PROM scale categorized by the follow-up time-point in 107 RCTs

From: Estimates of the mean difference in orthopaedic randomized trials: obligatory yet obscure

Weighted mean in percentages of the best score in the PROM scale Number of RCTs (%) Follow-up time not applicable Follow-up under 3 months Follow-up between 3 and 6 months Follow-up between 6 and 12 months Follow-up over 12 months
<=60 % 19 (18 %) 1 (5 %) 11 (58 %) 3 (5 %) 1 (5 %) 3 (16 %)
Over 60 % and < = 75 % 24 (23 %) 2 (8 %) 6 (25 %) 7 (29 %) 1 (4 %) 8 (33 %)
Over 75 % and < = 85 % 26 (25 %) 2 (8 %) 3 (12 %) 2 (8 %) 9 (35 %) 10 (38 %)
Over 85 % and < 90 % 23 (23 %) 0 4 (17 %) 3 (13 %) 4 (17 %) 12 (52 %)
Over 90 % 15 (14 %) 0 0 2 (13 %) 2 (13 %) 11 (73 %)