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Characteristics of participants in the 27 included studies
| Characteristics | No (%) of studies |
|---|---|
| Age group (years): | |
| ≥50 | 11 (41) |
| ≥60 | 10 (37) |
| ≥70 | 2 (7) |
| 50-59 | 1 (4) |
| 50-70 | 1 (4) |
| 60-70 | 1 (4) |
| 60-88 | 1 (4) |
| Immune related health: | |
| Immunocompetent† | 23 (85) |
| Immunodeficient | 2 (7) |
| Mixed | 2 (7) |
| Proportion women (%): | |
| <50 | 5 (19) |
| 50-60 | 13 (48) |
| 61-75 | 9 (33) |
| History of herpes zoster: | |
| Yes | 1 (4) |
| No | 24 (89) |
| Not reported | 2 (7) |
| History of varicella zoster: | |
| Yes | 18 (67) |
| No | 1 (4) |
| Not reported | 8 (30) |
