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Characteristics of Fifteen Studies Included in the Systematic Review
| Characteristics | Frequency (percentage) |
|---|---|
| Total number of studies | 15 (100%) |
| Total number of patients | 11612 [100(0.86%) -8478 (73%)] |
| Country | |
| Brazil | 3 (20%) |
| Turkey | 2 (13.3%) |
| Spain | 2 (13.3%) |
| USA | 2 (13.3%) |
| India | 1 (7%) |
| Finland | 1 (7%) |
| France | 1 (7%) |
| Japan | 1 (7%) |
| Germany | 1 (7%) |
| Malaysia | 1 (7%) |
| Study design | |
| Self-administered | 6 (40%) |
| Combination (self-administered /telephone/face-to-face interview) | 9 (60%) |
