Table 5.
Baseline characteristics of the study population
| Cases (%) | Controls (%) | χ2/Z | p value | |
|---|---|---|---|---|
| Gender | ||||
| Male | 209 (70.4) | 185 (71.2) | 0.04 | 0.84 |
| Female | 88 (29.6) | 75 (28.8) | ||
| Age (years) | 45.66 ± 11.764 | 45.48 ± 11.804 | − 0.16 | 0.87 |
| Education | ||||
| Primary education | 63 (21.2) | 55 (21.2) | 1.97 | 0.37 |
| Secondary education | 88 (29.6) | 64 (24.6) | ||
| Bachelor degree | 146 (49.2) | 141 (54.2) | ||
| Marital status | ||||
| Single | 31 (10.4) | 36 (13.8) | 1.52 | 0.22 |
| Married or divorced | 266 (89.6) | 224 (86.2) | ||
| Income (¥) | ||||
| < 1000 | 16 (5.4) | 15 (5.8) | 0.36 | 0.83 |
| 1000–2000 | 83 (27.9) | 78 (30) | ||
| ≥ 2000 | 198 (66.7) | 167 (64.2) | ||
| BMI (kg/m2) | ||||
| < 18.5 | 2 (0.7) | 9 (3.5) | 117.95 | < 0.001 |
| 18.5–23.9 | 99 (33.3) | 193 (74.2) | ||
| 24.0–27.9 | 149 (50.2) | 57 (21.9) | ||
| ≥ 28 | 47 (15.8) | 1 (0.4) | ||
| Blood pressure (mm/Hg) | ||||
| < 140/90 | 211 (71) | 211 (81.2) | 7.72 | 0.01 |
| ≥ 140/90 | 86 (29) | 49 (18.8) | ||
| Diabetes | ||||
| Yes | 12 (4) | 7 (97.3) | 0.77 | 0.38 |
| No | 285 (96) | 253 (2.7) | ||
| Tea consumption | ||||
| No | 112 (37.7) | 109 (41.9) | 1.03 | 0.311 |
| Yes | 185 (62.3) | 151 (58.1) | ||
| Smoking habit | ||||
| No | 220 (74.1) | 197 (75.8) | 0.21 | 0.65 |
| Yes | 77 (25.9) | 63 (24.2) |
Bold indicates that the analysis result is statistically significant