Table 1.
Baseline characteristics of case and control groups in PSM and IPTW population.
| Variables | 1:1 PSM | IPTW | |||||
|---|---|---|---|---|---|---|---|
| Control | Case | SMD | Control | Case | SMD | ||
| N | 288 | 288 | 1,559.4 | 1,467.6 | |||
| Gender | Male | 157 (54.5) | 166 (57.6) | 0.063 | 831.3 (53.3) | 753.3 (51.3) | 0.040 |
| Female | 131 (45.5) | 122 (42.4) | 728.1 (46.7) | 714.3 (48.7) | |||
| Agegroup (years) | <60 | 114 (39.6) | 120 (41.7) | 0.042 | 487.3 (31.3) | 497.0 (33.9) | 0.056 |
| ≥60 | 174 (60.4) | 168 (58.3) | 1,072.1 (68.7) | 970.6 (66.1) | |||
| Occupation | Farmer | 96 (33.3) | 106 (36.8) | 0.073 | 707.6 (45.4) | 637.6 (43.4) | 0.043 |
| Worker | 34 (11.8) | 32 (11.1) | 175.4 (11.2) | 162.6 (11.1) | |||
| Office worker and others | 158 (54.9) | 150 (52.1) | 676.4 (43.4) | 667.4 (45.5) | |||
| Education level | Illiteracy | 30 (10.4) | 29 (10.1) | 0.037 | 269.5 (17.3) | 241.8 (16.5) | 0.062 |
| Primary-middle school | 184 (63.9) | 189 (65.6) | 990.6 (63.5) | 907.5 (61.8) | |||
| High school and above | 74 (25.7) | 70 (24.3) | 299.3 (19.2) | 318.3 (21.7) | |||
| BMI | 18.5–23.9 | 161 (55.9) | 168 (58.3) | 0.049 | 834.0 (53.5) | 781.5 (53.2) | 0.005 |
| <18.5 or ≥24 | 127 (44.1) | 120 (41.7) | 725.5 (46.5) | 686.2 (46.8) | |||
| Residence | Rural | 204 (70.8) | 202 (70.1) | 0.015 | 1,214.0 (77.9) | 1,098.6 (74.9) | 0.071 |
| Urban | 84 (29.2) | 86 (29.9) | 345.4 (22.1) | 369.0 (25.1) | |||
| Family history of cancer | No | 250 (86.8) | 256 (88.9) | 0.064 | 1,406.6 (90.2) | 1,314.6 (89.6) | 0.021 |
| Yes | 38 (13.2) | 32 (11.1) | 152.8 (9.8) | 153.0 (10.4) | |||
| Smoking status | No | 187 (64.9) | 179 (62.2) | 0.058 | 1,050.5 (67.4) | 1,006.7 (68.6) | 0.026 |
| Yes | 101 (35.1) | 109 (37.8) | 508.9 (32.6) | 460.9 (31.4) | |||
| Drinking status | No | 214 (74.3) | 205 (71.2) | 0.07 | 1,207.4 (77.4) | 1,121.0 (76.4) | 0.025 |
| Yes | 74 (25.7) | 83 (28.8) | 352.0 (22.6) | 346.6 (23.6) | |||
| Tea drinking status | No | 187 (64.9) | 181 (62.8) | 0.043 | 1,071.0 (68.7) | 1,013.8 (69.1) | 0.009 |
| Yes | 101 (35.1) | 107 (37.2) | 488.4 (31.3) | 453.8 (30.9) | |||
| Red meat intake | ≥3 times | 73 (25.3) | 69 (24.0) | 0.032 | 429.6 (27.5) | 377.2 (25.7) | 0.042 |
| (per week) | <3 times | 215 (74.7) | 219 (76.0) | 1,129.8 (72.5) | 1,090.4 (74.3) | ||
| Seafood intake | ≥1 times | 162 (56.2) | 167 (58.0) | 0.035 | 792.7 (50.8) | 692.6 (47.2) | 0.073 |
| (per week) | <1 times | 126 (43.8) | 121 (42.0) | 766.7 (49.2) | 775.0 (52.8) | ||
| Fish intake | ≥3 times | 159 (55.2) | 159 (55.2) | <0.001 | 747.8 (48.0) | 643.4 (43.8) | 0.083 |
| (per week) | <3 times | 129 (44.8) | 129 (44.8) | 811.6 (52.0) | 824.2 (56.2) | ||
| Vegetable intake | ≥2 times | 109 (37.8) | 104 (36.1) | 0.036 | 418.4 (26.8) | 452.1 (30.8) | 0.088 |
| (per day) | <2 times | 179 (62.2) | 184 (63.9) | 1,141.0 (73.2) | 1,015.5 (69.2) | ||
| Fruit intake | ≥3 times | 183 (63.5) | 170 (59.0) | 0.093 | 690.9 (44.3) | 693.4 (47.2) | 0.059 |
| (per week) | <3 times | 105 (36.5) | 118 (41.0) | 868.5 (55.7) | 774.2 (52.8) | ||