Table 1.
General characteristics of cases and controls stratified by sex, n (%)
| Variables | Men (n=728) | Women (n=340) | ||||
| Cases (n=364) | Controls (n=364) | P values* | Cases (n=170) | Controls (n=170) | P values* | |
| Age (years) | 0.66 | 0.99 | ||||
| <40 | 118 (32.42) | 116 (31.87) | 25 (14.71) | 22 (12.94) | ||
| 40~60 | 217 (59.61) | 212 (58.24) | 123 (72.35) | 122 (71.76) | ||
| ≥60 | 29 (7.97) | 36 (9.89) | 22 (12.94) | 26 (15.30) | ||
| Education level | 0.04 | 0.75 | ||||
| primary school and less than | 10 (2.75) | 23 (6.32) | 30 (17.65) | 26 (15.29) | ||
| junior middle and high school | 147 (40.38) | 128 (35.16) | 76 (44.70) | 74 (43.53) | ||
| junior college or above | 207 (56.87) | 213 (58.52) | 64 (37.65) | 70 (41.18) | ||
| Occupational status | 0.39 | 0.43 | ||||
| mental labour | 108 (29.67) | 104 (28.57) | 50 (29.41) | 48 (28.24) | ||
| physical labour | 86 (23.63) | 102 (28.02) | 25 (14.71) | 34 (20.00) | ||
| other | 170 (46.70) | 158 (43.41) | 95 (55.88) | 88 (51.76) | ||
| Income (yuan/month) | 0.35 | 0.85 | ||||
| <2000 | 17 (4.67) | 17 (4.67) | 15 (8.82) | 18 (10.59) | ||
| 2000~3000 | 87 (23.90) | 104 (28.57) | 70 (41.18) | 70 (41.18) | ||
| ≥3000 | 260 (71.43) | 243 (66.76) | 85 (50.00) | 82 (48.23) | ||
| Marital status | 0.24 | 0.52 | ||||
| single | 45 (12.36) | 56 (15.38) | 4 (2.35) | 6 (3.53) | ||
| married or other | 319 (87.64) | 308 (84.62) | 166 (97.65) | 164 (96.47) | ||
| Smoking status | 0.30 | 0.16 | ||||
| never smoker | 199 (54.67) | 213 (58.52) | 168 (98.82) | 170(100) | ||
| smoker | 165 (45.33) | 151 (41.48) | 2 (1.18) | 0 (0.00) | ||
| Tea drinking status | 0.30 | 0.01 | ||||
| yes | 258 (70.88) | 245 (63.31) | 77 (45.29) | 55 (32.35) | ||
| no | 106 (29.12) | 119 (32.69) | 93 (54.71) | 115 (67.55) | ||
| Physical activity | 0.02 | 0.88 | ||||
| light | 175 (48.08) | 137 (37.64) | 19 (11.18) | 19 (11.18) | ||
| moderate | 100 (27.47) | 121 (33.24) | 47 (27.64) | 43 (25.29) | ||
| severe | 89 (24.45) | 106 (29.12) | 104 (61.18) | 108 (63.53) | ||
| BMI (kg/m2) | <0.001 | <0.001 | ||||
| <18.5 | 2 (0.55) | 11 (3.02) | 1 (0.59) | 9 (5.29) | ||
| 18.5~24.0 | 107 (29.40) | 257 (70.61) | 72 (42.35) | 125 (73.53) | ||
| ≥24.0 | 255 (70.05) | 96 (26.37) | 97 (57.06) | 36 (21.18) | ||
| History of diabetes | 0.67 | 0.18 | ||||
| yes | 12 (3.30) | 10 (2.75) | 10 (5.88) | 5 (2.94) | ||
| no | 352 (96.70) | 354 (97.25) | 160 (94.12) | 165 (94.06) | ||
| History of hypertension | 0.85 | 0.63 | ||||
| yes | 15 (4.12) | 16 (4.40) | 8 (4.71) | 10 (5.88) | ||
| no | 349 (95.88) | 348 (95.60) | 162 (95.29) | 160 (94.12) | ||
| History of hyperlipidaemia | 0.01 | <0.001 | ||||
| yes | 108 (29.67) | 77 (21.15) | 51 (30.00) | 21 (12.35) | ||
| no | 256 (70.33) | 287 (78.85) | 119 (70.00) | 149 (87.65) | ||
| MUFA intake, g/day† | 34.10 (28.49–39.65) | 31.39 (26.55–36.79) | <0.001 | 29.99 (26.37–36.37) | 28.05 (22.40–31.39) | <0.001 |
| PUFA intake, g/day† | 26.25 (24.04–29.16) | 23.90 (22.01–26.02) | <0.001 | 24.52 (22.11–27.12) | 21.21 (18.83–24.53) | <0.001 |
| Energy intake, kJ/day‡ | 10395.64±2425.37 | 9890.97±2348.76 | 0.01 | 7509.73±1650.71 | 7323.78±1852.97 | 0.04 |
*P values were calculated by using the χ2 test for categorical variables and Wilcoxon rank-sum test and analysis of variance (ANOVA) tests for continues variables.
†Medians (IQRs).
‡Mean (SD).
BMI, body mass index; MUFA, monounsaturated fatty acid; PUFA, polyunsaturated fatty acid.