From: Analysis and reporting of stratified cluster randomized trials—a systematic survey
Characteristics | Number of studies included; n = 185 |
---|---|
Publication year; n (%) | |
Before 2000 | 7 (4) |
Between 2001 and 2010 | 30 (16) |
Between 2011 and 2019 | 148 (80) |
Center of study; n (%) | |
One | 89 (48) |
Two | 44 (24) |
Three or more | 52 (28) |
Country of the study; n (%) | |
UK | 32 (17) |
USA | 26 (14) |
Canada | 8 (4) |
India | 7 (4) |
Australia | 15 (8) |
Denmark | 7 (4) |
Germany | 5 (3) |
Netherlands | 6 (3) |
South Africa | 8 (4) |
Others | 71 (39) |
Clinical area; n (%) | |
Child development | 36 (19) |
Primary care | 27 (15) |
Maternal and child health | 16 (9) |
HIV | 12 (6) |
Cancer | 9 (5) |
Malaria | 9 (5) |
Cardiovascular | 5 (3) |
Cognitive and mental health | 10 (5) |
Others | 61 (33) |
Setting of the study; n (%) | |
School | 36 (19) |
General practice/primary care | 38 (21) |
Community | 36 (19) |
Hospital | 18 (10) |
Village | 10 (5) |
Family | 6 (3) |
Others | 41 (22) |
Design of the study; n (%) | |
Parallel | 165 (89) |
Cross-over | 2 (1) |
Stepped wedge | 3 (2) |
Factorial | 7 (4) |
Matched pair | 6 (3) |
Split-plot | 1 (1) |
Zelen design | 1 (1) |
Arm of the study; n (%) | |
2 | 140 (76) |
3 | 28 (15) |
4 | 14 (8) |
5 | 2 (1) |
6 or more | 1 (1) |