| Study | Population |
Metabolic disorder | Participants | No. of cases (O) |
No. of control (NO) | Genotype | Pro/Pro | Pro/Ala | Ala/Ala | O | NO | O | NO | O | NO |
| Ghoussaini et al., 2005 [17] | French | Obesity (children) | 591 | 396 | 195 | 304 | 156 | 84 | 39 | 8 | 0 | Ghoussaini et al., 2005 [17] | French | Obesity (adults) | 1713 | 1102 | 611 | 857 | 478 | 231 | 123 | 12 | 10 | González Sánchez et al., 2002 [18] | Spanish | Obesity | 459 | 145 | 314 | 119 | 264 | 25 | 50 | 1 | 3 | Oh et al., 2000 [1] | Korean | Obesity | 229 | 111 | 118 | 103 | 108 | 8 | 9 | 0 | 1 | Ereqat et al., 2009 [19] | Palestinian | Obesity (T2D individuals) | 202 | 121 | 81 | 106 | 73 | 15 | 8 | — | — | Ben Ali et al., 2009 [20] | Tunisian | Obesity | 675 | 387 | 288 | 348 | 271 | 39 | 17 | — | — |
| Summary | | | 3869 | 2262 | 1607 | 1837 | 1350 | 402 | 246 | 21 | 14 |
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