Table 2. Demographic characteristics of study population.
| Frist author | Cohorts | Age (mean±SD or mean) |
Age matching status | Sex (male%) |
||
| Case | Control | Case | Control | |||
| Ennis et al[18] | UK | 77.85±8.83 | 70.59±9.35 | unmatched | 37.9 | 48.5 |
| Ennis et al[18] | US (Lowa) | 81.18±9.12 | 74±9.04 | unmatched | 39.4 | 46.5 |
| Park et al[19] | Mayo | 76.9±9.6 | 69.5±8.2 | unmatched | 35.5 | 45.4 |
| Park et al[19] | Areds | 79.9±5.1 | 77.6±4.3 | matched | 40.5 | 44.1 |
| Allikmets et al[20] | Columbia | NA | NA | matched | NA | NA |
| Allikmets et al[20] | Lowa | NA | NA | matched | NA | NA |
| Allikmets et al[20] | Amsterdam | NA | NA | matched | NA | NA |
| Allikmets et al[20] | Rotterdam | NA | NA | matched | NA | NA |
| Allikmets et al[20] | Australia | NA | NA | matched | NA | NA |
| Allikmets et al[20] | Germany | NA | NA | matched | NA | NA |
| Allikmets et al[20] | Areds | NA | NA | matched | NA | NA |
| Carter and Churchill [21] | UK | NA | NA | matched | 28 | 33.7 |
| Lu et al[23] | China | 68.2±9.8 | 68.4±7.2 | matched | 46.3 | 46.3 |
| Lee et al[22] | US | 79.3 | 69.5 | unmatched | 31.9 | 45.3 |
| Nakata et al[24] | Japan | 77.38±8.39 | NA | unmatched | 71.6 | 41.5 |
| Tian et al[25] | China | NA | NA | unmatched | 60.6 | 46.3 |
NA: Data not available; SD: Standard deviation.