Table 3 Percentages of included reviews by year including assessment of heterogeneity, quality and dissemination bias
Year | Total no. included reviews | Heterogeneity (no. (%)) | Quality (no. (%)) | Dissemination bias (no. (%)) |
|---|---|---|---|---|
1994 | 4 | 2 (50) | 1 (25) | 1 (25) |
1995 | 8 | 7 (88) | 1 (13) | 4 (50) |
1996 | 9 | 8 (89) | 1 (11) | 6 (67) |
1997 | 15 | 12 (80) | 8 (53) | 5 (33) |
1998 | 16 | 14 (88) | 3 (19) | 10 (63) |
1999 | 19 | 18 (95) | 8 (42) | 12 (63) |
2000 | 11 | 9 (82) | 4 (36) | 4 (36) |
2001 | 22 | 19 (86) | 8 (36) | 15 (68) |
2002 | 21 | 16 (76) | 13 (62) | 8 (38) |
2003 | 22 | 16 (73) | 10 (45) | 15 (68) |
2004 | 13 | 11 (85) | 7 (54) | 5 (38) |
2005 | 4 | 4 (100) | 4 (100) | 3 (75) |
2006 | 2 | 2 (100) | 2 (100) | 1 (50) |