Table 1 Frequency distributions of selected characteristics of ESCC cases and controls
Variables | Cases No. (%) | Controls No. (%) | P a |
|---|---|---|---|
All subjects | 1,116 (100.0) | 1,117 (100.0) | |
Age, yr | 0.890 | ||
Range | 37–88 | 32–86 | |
Meanb | 60.4 ± 8.3 | 60.3 ± 10.2 | |
Age group | |||
≤50 | 143 (12.8) | 151 (13.5) | |
51–60 | 423 (37.9) | 405 (36.3) | |
61–70 | 411 (36.8) | 405 (36.3) | |
>70 | 139 (12.5) | 156 (13.9) | |
Sex | 0.410 | ||
Males | 897 (80.4) | 882 (79.0) | |
Females | 219 (19.6) | 235 (21.0) | |
Drinking status | <0.0001 | ||
Ever | 498 (44.6) | 369 (33.0) | |
Never | 618 (55.4) | 748 (67.0) | |
Smoking status | 0.0038 | ||
Ever | 681 (61.0) | 614 (55.0) | |
Never | 435 (39.0) | 503 (45.0) | |
Pack-years | <0.0001 | ||
0 | 435 (39.0) | 503 (45.0) | |
≤16 (mean) | 150 (13.4) | 246 (22.0) | |
>16 (mean) | 531 (47.6) | 368 (33.0) | |
Body mass index | <0.0001 | ||
<25.0 | 721 (64.6) | 485 (43.4) | |
≥25.0 | 395 (35.4) | 632 (56.6) |
