Fan et al. [6] |
Randomized trial |
Recruited: 1993 |
2,999 |
Sino-implant (II) vs China 6-capsule vs Norplant |
5 |
‘Randomized prospective’ study. No information on sequence generation or allocation concealment. Follow-up was >99%. |
Fang et al. [4] |
Randomized trial |
Recruited: Nov 93 to Jan 95 |
19,673 |
Sino-implant (II) vs China 6-capsule |
2 |
Participants were ‘randomly allocated.’ No information on sequence generation or allocation concealment. Follow-up was 94%. |
Qi et al. [7] |
Randomized trials (Phase I and II) |
Dec 1993 to Jan 1995 |
2,300 |
Sino-implant (II) vs China 6-capsule vs Norplant (Phase I only) |
5 |
Participants ‘randomly enrolled.’ No information on sequence generation or allocation concealment. Follow-up >99%. Two cases excluded for non-compliance. |
Xing et al. [8] |
Randomized trial |
Nov 1993 to Jan 1995 |
7,941 |
Sino-implant (II) vs China 6-capsule |
5 |
Eligible persons ‘randomized into groups of the study.’ No information on sequence generation or allocation concealment. Follow-up was 92%. |