References | Type of periodontitis | Source of controls | Geographic area(s) | Case number | Control number | Cases | Controls | HWE | |||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
GG | GC | CC | GG | GC | CC | χ2 | P | ||||||
Ho, 2008 (15) | CP | HB | Taiwan | 343 | 153 | 242 | 93 | 8 | 89 | 60 | 4 | 2.77 | 0.096 |
Ho, 2008 (15) | AP | HB | Taiwan | 85 | 153 | 81 | 3 | 1 | 89 | 60 | 4 | 2.77 | 0.096 |
Sun, 2009 (16) | CP | PB | Guangdong | 150 | 143 | 119 | 29 | 2 | 119 | 21 | 3 | 2.85 | 0.091 |
Xie, 2009 (17) | CP | HB | Guangdong | 146 | 148 | 137 | 9 | 0 | 128 | 20 | 0 | 0.78 | 0.378 |
Loo, 2011 (18) | CP | PB | Sichuan | 280 | 250 | 134 | 68 | 78 | 152 | 90 | 8 | 1.50 | 0.221 |
Li, 2012 (19) | CP | PB | Sichuan | 122 | 532 | 55 | 33 | 34 | 316 | 204 | 12 | 10.24 | 0.001 |
Duan, 2012 (20) | CP | PB | Ningxia | 273 | 284 | 205 | 57 | 11 | 223 | 54 | 7 | 2.72 | 0.099 |