Table 4.
Demographic characteristics of the cumulative studies
| Author | Total N* | Attrition % From Enrollment To Final Follow Up | Mean Age in years (Range) | Gender | ||||
| Males | Females | |||||||
| Intervention | Control | Study Duration | ||||||
| Andersson et al [35] | 117 | 13% | 7% | 6 weeks | 47.8 | 62 | 55 | |
| Bangsberg et al [31] | 110 | NA | NA | NA | 46 | 96 | 14 | |
| Bell & Kahn [3] | 4876 | NA | NA | NA | 38.2 | 2455 | 2421 | |
| Celio et al [36] | 76 | 12% | 31% | 26 weeks | 19.6 (18-36) | 0 | 76 | |
| Christensen et al [37] | 3530 | 48% reported combined | self paced | 35.5 | 1567 | 1963 | ||
| Chou [32] | 359 | NA | NA | NA | 42.7 | 280 | 79 | |
| Clarke et al [38] | 299 | 41% reported combined | 32 weeks | 43.7 | 73 | 226 | ||
| Flatley-Brennan [39] | 57 | 20% | 12% | 26 weeks | 33.2 | 53 | 4 | |
| Gustafson et al [40] | 204 | 12% | 8% | 26 weeks | 34.6 | 184 | 20 | |
| Harvey-Berino et al [41] | 46 | 4% reported combined | 37 weeks | 46.3 (31-60) | 9 | 37 | ||
| Harvey-Berino et al [42] | 122 | 18% reported combined | 78 weeks | 48.4 | 18 | 104 | ||
| Homer et al [43] | 137 | 25% | 20% | 40 weeks | 7.4 (3-12) | 95 | 42 | |
| Krishna et al [44] | 228 | 53% | 58% | 52 weeks | Not Specified | 148 | 80 | |
| Lange et al [45] | 184 | 53% | 48% | 5 weeks | 47.8 | Not Specified | ||
| Marshall et al [46] | 655 | 14% | 19% | 10 weeks | 43 | 321 | 334 | |
| Oenema et al [47] | 198 | NA | NA | NA | 44 | 75 | 123 | |
| Ritterband et al [48] | 24 | 0% | 0% | 3 weeks | 8.4 | 5 | 19 | |
| Soetikno et al [33] | 100 | NA | NA | NA | 44.5 (midpoint) (35-54) | 55 | 45 | |
| Southard et al [49] | 106 | 4% | 0% | 52 weeks | 62 (37-86) | 80 | 26 | |
| Strom et al [50] | 102 | 44% reported combined | 6 weeks | 36.7 (19-62) | 33 | 69 | ||
| Winzelberg et al [51] | 60 | 23% | 31% | 20 weeks | 20 (18-33) | 0 | 60 | |
| Wu et al [34] | 164 | NA | NA | NA | 41.5 | 120 | 44 | |
| Combined** | 11754 | 21% | 21% | 41.5 | 5,729 | 5,841 | ||
* Sample size (N) was derived from the number of cases newly enrolled into each study
** Combined average age excluded: (1) Homer et al [43]; Ritterband et al [48]; Krishna et al [44]: subjects were all children 17 years of age or less. (2) Christensen et al [37], only those who participated in the completion of the Goldberg Depression Scale portion of the study. (3) Soetikno et al [33], only age range and midpoint were reported. Gender data were not reported by Lange et al [45]. Attrition rates were combined only for those specifying intervention/control.
NA=Non-longitudinal Study