Table 4

The stratified analyses according to systems that cancer belonged to

Types of cancerCasesControlsOR (95% CI)P value
Cancer of the digestive system (oral cavity, oesophagus, stomach, colon or rectum, liver, pancreas)762281.67 (1.11 to 2.53)0.015
Respiratory cancer (lung, larynx, other pharynx)461381.10 (0.47 to 2.60)0.825
Cancers of the female reproductive system and breast cancer (ovary, cervix, endometrium)772314.22 (1.62 to 10.95)0.003
Others1073211.70 (0.85 to 3.39)0.132