| Internal pilot (N = 97) | No internal pilot (N = 37) | Total (N = 134) | |
---|---|---|---|---|
Total target sample size | n | 97 | 36 | 133 |
Mean (SD) | 945.1 (1400.0) | 1171.8 (1460.3) | 1006.5 (1414.6) | |
Median (IQR) | 510.0 (350.0, 900.0) | 625.0 (395.0, 1,349.2) | 533.0 (360.0, 1,044.0) | |
Minimum, maximum | 120, 9920 | 100, 8000 | 100, 9920 | |
Recruitment target for internal pilot | n | 69 | – | 69 |
Mean (SD) | 135.2 (156.8) | – | 135.2 (156.8) | |
Median (IQR) | 100.0 (48.0, 162.0) | – | 100.0 (48.0, 162.0) | |
Minimum, maximum | 20, 1165 | – | 20, 1165 | |
Proportion of sample size aimed to be recruited in internal pilot (%) | n | 69 | – | 69 |
Mean (SD) | 18.5 (10.4) | – | 18.5 (10.4) | |
Median (IQR) | 15.8 (10.2, 25.0) | – | 15.8 (10.2, 25.0) | |
Minimum, maximum | 2.3, 50 | – | 2.3, 50 | |
Length of recruitment for full study (months) | n | 96 | 35 | 131 |
Mean (SD) | 28.6 (10.9) | 22.3 (9.1) | 26.9 (10.8) | |
Median (IQR) | 24.0 (20.8, 36.0) | 20.0 (16.5, 30.0) | 24.0 (18.0, 36.0) | |
Minimum, maximum | 11, 60 | 5, 45 | 5, 60 | |
Length of recruitment for internal pilot (months) | n | 96 | – | 96 |
Mean (SD) | 9.4 (5.1) | – | 9.4 (5.1) | |
Median (IQR) | 8.5 (6.0, 12.0) | – | 8.5 (6.0, 12.0) | |
Minimum, maximum | 3, 30 | – | 3, 30 | |
Proportion of recruitment length used in internal pilot (%) | n | 95 | – | 95 |
Mean (SD) | 33.5 (12.6) | – | 33.5 (12.6) | |
Median (IQR) | 33.3 (25.0, 40.8) | – | 33.3 (25.0, 40.8) | |
Minimum, maximum | 9.4, 68.8 | – | 9.4, 68.8 | |
Number of centres involved in full study | n | 91 | 30 | 121 |
Mean (SD) | 20.9 (22.1) | 19.9 (17.1) | 20.6 (20.9) | |
Median (IQR) | 14.0 (7.5, 25.0) | 15.5 (6.0, 29.0) | 14.0 (7.0, 26.0) | |
Minimum, maximum | 1, 120 | 3, 70 | 1, 120 | |
Number of centres involved in internal pilot | n | 88 | – | 88 |
Mean (SD) | 9.4 (11.6) | – | 9.4 (11.6) | |
Median (IQR) | 6.0 (4.0, 12.0) | – | 6.0 (4.0, 12.0) | |
Minimum, maximum | 1, 100 | – | 1, 100 | |
Proportion of centres used in internal pilot (%) | n | 86 | – | 86 |
Mean (SD) | 56.8 (31.3) | – | 56.8 (31.3) | |
Median (IQR) | 49.0 (33.3, 100.0) | – | 49.0 (33.3, 100.0) | |
Minimum, maximum | 9.5, 100 | – | 9.5, 100 |