H. pylori infection | Controls | Location of ESCC | Total cases | ||||
---|---|---|---|---|---|---|---|
 |  | Upper + Middle | lower |  |  | ||
 | No. (%) | No. (%) | AOR1 (95% CI) | No. (%) | AOR1 (95% CI) | No. (%) | AOR1 (95% CI) |
Negative | 92 (47) | 76 (62) | 1.0 | 38 (66) | 1.0 | 114 (63) | 1.0 |
Positive | 102 (53) | 46 (38) | 0.6 (0.3 – 1.1) | 20 (34) | 0.5 (0.2 – 1.0) | 66 (37) | 0.5 (0.3 – 0.9) |