Table 1. Baseline characteristics of case and control subjects.
| Characteristics | Controls (%) (n=1910) | OSCC-UOFa (%) (n=119) | OSCC-LOF b (%) (n=578) | χ2 | P-value |
|---|---|---|---|---|---|
| Age (years) | 2.437 | 0.296 | |||
| ≤60 | 1039 (54.40) | 58 (48.74) | 326 (56.40) | ||
| >60 | 871 (45.60) | 61 (51.26) | 252 (43.60) | ||
| Gender | 0.857 | 0.651 | |||
| Male | 1287 (67.38) | 81 (68.07) | 378 (65.40) | ||
| Female | 623 (32.62) | 38 (31.93) | 200 (34.60) | ||
| Education level | 1.844 | 0.765 | |||
| Illiterate | 201 (10.52) | 14 (11.76) | 61 (10.55) | ||
| Primary and middle school | 1258 (65.87) | 81 (68.07) | 370 (64.01) | ||
| High school and above | 451 (23.61) | 24 (20.17) | 147 (25.43) | ||
| Residence | 4.647 | 0.098 | |||
| Rural | 1104 (57.80) | 75 (63.03) | 311 (53.81) | ||
| Urban | 806 (42.20) | 44 (36.97) | 267 (46.19) | ||
| BMI (kg/m2)a | 111.444 | <0.001 | |||
| 18.5-23.9 | 1053 (55.13) | 79 (66.39) | 367 (63.49) | ||
| <18.5 | 99 (5.18) | 15 (12.60) | 85 (14.71) | ||
| ≥24 | 758 (39.69) | 25 (21.01) | 126 (21.80) | ||
| Family history of cancer | 18.344 | <0.001 | |||
| No | 1693 (88.64) | 102 (85.71) | 473 (81.83) | ||
| Yes | 217 (11.36) | 17 (14.29) | 105 (18.17) |
aoral squamous cell carcinoma occurs on the upper oral fissure
boral squamous cell carcinoma occurs on the lower oral fissure