Table 1.
The characteristics of study population
| Characteristics | Controls (n = 184) | Cases (n = 184) | P-value |
|---|---|---|---|
| Gender, n (%) | – | ||
| Male | 65 (35.3) | 65 (35.3) | |
| Female | 119 (64.7) | 119 (64.7) | |
| Age (years), n (%) | – | ||
| ≤ 44 | 115 (62.5) | 116 (63.0) | |
| 45-59 | 51 (27.7) | 49 (26.6) | |
| ≥ 60 | 18 (9.8) | 19 (10.4) | |
| BMI (kg/m2, Mean ± SD) | 23.37 ± 3.45 | 22.23 ± 2.74 | < 0.001 |
| Educational level, n (%) | 0.746 | ||
| Elementary school and below | 18 (9.8) | 23 (12.5) | |
| Junior/ high school | 88 (47.8) | 80 (43.5) | |
| College Degree and above | 78 (42.4) | 81 (44.0) | |
| Duration of residence (years), n (%) | 0.219 | ||
| ≤ 5 | 19 (10.3) | 22 (12.0) | |
| 5-10 | 53 (28.8) | 38 (20.7) | |
| > 10 | 112 (60.9) | 124 (67.4) | |
| Seafood, n (%) | 0.325 | ||
| < 1 times/week | 27 (14.7) | 31 (16.8) | |
| 1-2 times/week | 139 (75.5) | 144 (78.3) | |
| > 2 times/week | 18 (9.8) | 9 (4.9) | |
| Smoking, n (%) | 27 (14.7) | 37 (20.1) | 0.134 |
| Drinking, n (%) | 69 (37.5) | 97 (52.7) | 0.002 |
Note: BMI Body mass index, SD Standard deviation
P-value were derived from chi-square tests for categorical variables, Wilcoxon signed-rank test for continuous variables