Table 1.
Characteristics among EC cases and controls in Dafeng and Ganyu 1 n (%)
| Characteristics | Dafeng (high-risk) | Ganyu (low-risk) | P value2 | |||
| Case (n=291) | Control (n=291) | Control (n=240) | Case (n=240) | |||
| Gender: Male | 200 (68.7) | 200 (68.7) | 181 (75.4) | 181 (75.4) | 0.088 | |
| Female | 91 (31.3) | 91 (31.3) | 59 (24.6) | 59 (24.6) | ||
| Age (yr) Mean±SD | 64.8 ± 8.6 | 64.6 ± 8.9 | 65.4 ± 10.3 | 65.6 ± 10.4 | 0.002 | |
| <50 | 14 (4.8) | 17 (5.8 ) | 19 (7.9) | 17 (7.1) | ||
| 50-59 | 61 (30.0) | 59 (20.3) | 48 (20.0) | 51 (21.3) | ||
| 60-69 | 137(47.1) | 137 (47.1) | 78 (32.5) | 76 (31.7) | ||
| 70-79 | 71 (24.4) | 69 (23.7) | 77 (32.1) | 78 (32.5) | ||
| ≥80 | 8 (2.8) | 9 (3.1) | 18 (7.5) | 18 (7.5) | ||
| Level of education | ||||||
| Illiterate | 156 (53.6) | 130 (44.7) | 138 (57.7) | 164 (68.6) | <0.001 | |
| Primary school | 95 (32.7) | 119 (40.9) | 63 (26.4) | 54 (22.6) | ||
| Secondary school & above | 40 (13.7) | 42 (14.4) | 38 (15.9) | 21 (8.8 ) | ||
| Past economic status(By separate cut-off points) | ||||||
| Median (CNY/yr) | 1250 | 1500 | 1000 | 775 | 0.235 | |
| 1 (lowest) | 97 (33.5) | 55 (19.0) | 38 (16.2) | 47 (20.3) | ||
| 2 | 68 (23.5) | 64 (22.1) | 71 (30.2) | 87 (37.5) | ||
| 3 | 73 (25.2) | 96 (33.1) | 71 (30.2) | 59 (25.4) | ||
| 4 (highest) | 52 (17.9) | 75 (25.9) | 55 (23.4) | 39 (16.8) | ||
| Smoking status3 | ||||||
| Neversmoker | 92 (31.6) | 122 (41.9) | 95 (39.6) | 82 (34.2) | 0.067 | |
| Former-smoker | 71 (24.4) | 64 (22.0) | 19 (7.9) | 17 (7.1) | ||
| Current smoker | 128 (44.0) | 105 (36.1) | 126 (52.5) | 141 (58.7) | ||
| Alcohol drinking status4 | ||||||
| Never drinker | 175 (60.1) | 181 (62.2) | 143 (59.6) | 131 (54.6) | 0.076 | |
| Former drinker | 5 (1.7) | 7 (2.4) | 7 (2.9) | 7 (2.9) | ||
| Current drinker | 111 (38.1) | 103 (35.4) | 90 (37.5) | 102 (42.5) | ||
| Encountered misfortune in past10 yr: | ||||||
| No | 54 (18.6) | 41 (14.2) | 33 (14.0) | 54 (23.3) | 0.008 | |
| Yes | 237 (81.4) | 248 (85.8) | 203 (86.0) | 178 (76.7) | ||
| History of family cancer | ||||||
| No | 112 (38.5) | 86 (29.6) | 16 (6.7) | 29 (12.1) | <0.001 | |
| Yes | 179 (61.5) | 205 (70.5) | 224 (93.3) | 211 (87.9) | ||
| Body mass index | ||||||
| <18.5 | 60 (20.8) | 27 (9.3) | 18 (7.6) | 31 (13.4) | 0.014 | |
| 18.5-23.9 | 182 (63.0) | 192 (66.2) | 161 (67.9) | 155 (67.1) | ||
| 23.9-27.9 | 34 (11.8) | 60 (20.7 ) | 46 (19.4) | 28 (12.1) | ||
| ≥28 | 13 (4.5) | 11 (3.8) | 12 (5.1) | 17 (7.4) | ||
1 Some strata do not match the total because of missing values;
2
The P-value for comparing the distribution of factors between the two counties;
3
Never-smokers and ever-smokers were used for comparing the smoking habits between the two counties;
4
Because of the few numbers of former drinkers in both two counties, alcohol drinking status was categorized to never-drinkers and ever-drinkers for the comparison between the two counties and following analyses.