Table 2 Follow-up methodologies in RCTs
Follow-up Approach | P value | ||
|---|---|---|---|
Minimal | Intensive | ||
No. (%) | No. (%) | ||
Geographic location | |||
International | 12 (92) | 1(8) | 0.001 |
North America (USA and Canada) | 7 (70) | 3 (30) | |
Western Europe | 13 (34) | 25 (66) | |
East Asia (Japan, Vietnam, China) | 1 (20) | 4 (80) | |
Number of participating countries | |||
1 country | 16 (37) | 27 (63) | 0.004 |
> 1 country | 17 (74) | 6 (26) | |
Number of participating centers | |||
≤ 50 | 11 (38) | 18 (62) | 0.173 |
> 50 | 10 (59) | 7 (42) | |
Industry sponsorship | |||
Yes | 18 (49) | 19 (51) | 0.80 |
No | 15 (52) | 14 (48) | |
Number of enrolled patients | |||
≤ 1000 patients | 14 (41) | 20 (58) | 0.14 |
> 1000 patients | 19 (59) | 13 (41) | |
Date of beginning of patients enrollment | |||
From 1981 to 1997 | 23 (48) | 25 (52) | 0.58 |
From 1998 to 2002 | 10 (56) | 8 (44) | |