Table 1.
Characteristics of 122 included studies.
| Characteristics | No (%) of studies |
|---|---|
| Publication year | |
| 1971–1980 | 1 (1) |
| 1981–1990 | 0 (0) |
| 1991–2000 | 6 (5) |
| 2001–2010 | 23 (19) |
| 2011–2021 | 92 (75) |
| Follow-up period (months) | |
| 0–12 | 33 (27) |
| 13–24 | 22 (18) |
| 25–36 | 5 (4) |
| 37–48 | 6 (5) |
| 49–60 | 4 (3) |
| >60 | 1 (1) |
| Not reported or not detailed | 39 (32) |
| Without follow-up | 12 (10) |
| Geographical region | |
| Asia | 33 (27) |
| Europe | 43 (35) |
| North America | 45 (37) |
| Africa | 1 (1) |
| Age group (years) | |
| <60 | 103 (84) |
| ≥60 | 11 (9) |
| Not reported | 8 (7) |
| Proportion female (%) | |
| <50 | 80 (66) |
| ≥50 | 31 (25) |
| Not reported | 11 (9) |
| BMI (kg/m2) | |
| <25 | 17 (14) |
| 25–30 | 23 (19) |
| >30 | 6 (5) |
| Not reported | 76 (62) |
| History of diabetes (%) | |
| <20 | 71 (58) |
| ≥20 | 6 (5) |
| Not reported | 45 (37) |
| Sample size | |
| ≤100 | 42 (34) |
| 101–300 | 35 (29) |
| 301–500 | 10 (8) |
| 501–700 | 11 (9) |
| 701–1000 | 10 (8) |
| >1000 | 14 (11) |
Note: BMI: body mass index.