General characteristics of study participants.
| Characteristics | Non-drinkers (N=1389) | Tea drinkers (N=948) | Green tea drinkers (N=499) | ||
| Description | P value | Description | P value | ||
| Age (years) | 49.3 (15.47) | 50.9 (12.96) | 0.012 | 53.2 (13.15) | <0.001 |
| Age, years, n (%) | <0.001 | <0.001 | |||
| 18–39 | 462 (33.26) | 216 (22.78) | 89 (17.84) | ||
| 40–59 | 478 (34.41) | 446 (47.05) | 221 (44.29) | ||
| >60 | 449 (32.33) | 286 (30.17) | 189 (37.88) | ||
| Gender, n (%) | <0.001 | <0.001 | |||
| Male | 401 (28.87) | 516 (54.43) | 283 (56.71) | ||
| Female | 988 (71.13) | 432 (45.57) | 216 (43.29) | ||
| BMI (kg/m2) | 24.13 (4.00) | 24.93 (3.66) | <0.001 | 25.01 (3.58) | <0.001 |
| BMI, kg/m2, n (%) | <0.001 | <0.001 | |||
| <24 | 720 (51.95) | 397 (41.92) | 204 (40.88) | ||
| 24–27.99 | 459 (33.12) | 386 (40.76) | 208 (41.68) | ||
| >28 | 207 (14.94) | 164 (17.32) | 87 (17.43) | ||
| Blood pressure (mm Hg) | |||||
| SBP | 130.43 (17.42) | 131.07 (17.04) | 0.494 | 131.73 (16.68) | 0.148 |
| DBP | 79.34 (11.22) | 80.01 (11.02) | 0.530 | 80.02 (10.44) | 0.553 |
| Hypertension, n (%) | |||||
| Yes | 626 (45.07) | 447 (47.15) | 0.321 | 235 (47.09) | 0.436 |
| No | 763 (54.93) | 501 (52.85) | 264 (52.91) | ||
| Family history of diabetes, n (%) | |||||
| Yes | 321 (23.11) | 255 (26.90) | 0.037 | 131 (26.25) | 0.159 |
| No | 1068 (76.89) | 693 (73.10) | 368 (73.75) | ||
| History of dyslipidemia (%) | |||||
| Yes | 331 (23.83) | 317 (33.44) | <0.001 | 171 (34.27) | <0.001 |
| No | 1058 (76.17) | 631 (66.56) | 328 (65.73) | ||
| Alcohol consumption, n (%) | <0.001 | <0.001 | |||
| Yes | 105 (7.60) | 211 (22.30) | 117 (23.49) | ||
| No | 1277 (92.40) | 735 (77.70) | 381 (76.51) | ||
| Coffee drinking, n (%) | <0.001 | <0.001 | |||
| Yes | 332 (23.94) | 475 (50.16) | 233 (46.69) | ||
| No | 1055 (76.06) | 472 (49.84) | 266 (53.31) | ||
| Smoking status, n (%) | <0.001 | <0.001 | |||
| Daily | 65 (4.69) | 160 (16.95) | 81 (16.30) | ||
| Occasional | 26 (1.88) | 40 (4.24) | 18 (3.62) | ||
| Never | 1294 (93.43) | 744 (78.81) | 398 (80.08) | ||
| Physical activity at work, n (%) | 0.001 | 0.297 | |||
| High | 12 (0.87) | 5 (0.53) | 3 (0.60) | ||
| Moderate | 64 (4.62) | 25 (2.64) | 15 (3.01) | ||
| Low | 636 (45.89) | 505 (53.27) | 246 (49.30) | ||
| None/unemployed | 674 (48.63) | 413 (43.57) | 235 (47.09) | ||
| Leisure-time physical activity, n (%) | 0.198 | 0.214 | |||
| High | 12 (0.88) | 18 (1.91) | 10 (2.02) | ||
| Moderate | 130 (9.52) | 88 (9.36) | 43 (8.70) | ||
| Low | 939 (68.79) | 642 (68.30) | 334 (67.61) | ||
| None | 284 (20.81) | 192 (20.43) | 107 (21.66) | ||
| Education, n (%) | <0.001 | 0.031 | |||
| Bachelor’s degree or higher | 716 (52.07) | 565 (60.36) | 275 (55.67) | ||
| High school | 576 (41.89) | 343 (36.65) | 203 (41.09) | ||
| Primary school | 68 (4.95) | 24 (2.56) | 14 (2.83) | ||
| Illiterate | 15 (1.09) | 4 (0.43) | 2 (0.40) | ||
| PSQI score | 4.83 (3.30) | 4.54 (2.90) | 0.347 | 4.73 (2.95) | 0.647 |
Data are presented as mean (SD) or median (IQR) for continuous variables and n (%) for categorical variables.
BMI, body mass index; DBP, diastolic blood pressure; PSQI, Pittsburgh Sleep Quality Index; SBP, systolic blood pressure.