Table 1. Main characteristics of case and control subjects.
| Variables | Cases (%) | Controls (%) | P-value |
|---|---|---|---|
| (n = 421) | (n = 1398) | ||
| Age(years) | 0.114 | ||
| ≤60 | 218(51.78) | 785(56.15) | |
| >60 | 203(48.22) | 613(43.85) | |
| Gender | 0.126 | ||
| Male | 105(24.94) | 402(28.76) | |
| Female | 316(75.06) | 996(71.24) | |
| Residence | 0.112 | ||
| Rural | 242(57.48) | 742(53.08) | |
| Urban | 179(42.52) | 656(46.92) | |
| Education level | <0.001 | ||
| Primary and below | 191(45.37) | 593(42.42) | |
| Middle school | 174(41.33) | 448(32.05) | |
| College and above | 56(13.30) | 357(25.54) | |
| Marital status | <0.001 | ||
| Married | 374(88.84) | 1132(80.97) | |
| Other | 47(11.16) | 266(19.03) | |
| BMI (kg/m2) | <0.001 | ||
| 18.5-23.9 | 259(61.52) | 809(57.87) | |
| <18.5 | 52(12.35) | 102(7.30) | |
| ≥24 | 110(26.13) | 487(34.84) | |
| Denture wearing | <0.001 | ||
| No | 216(51.31) | 873(62.45) | |
| Yes | 205(48.69) | 525(37.55) | |
| Tea consumption | 0.015 | ||
| No | 345(81.95) | 1067(76.32) | |
| Yes | 76(18.05) | 331(23.68) | |
| Milk consumption | <0.001 | ||
| No | 254(60.33) | 685(49.00) | |
| Yes | 167(39.67) | 713(51.00) |