Table 1 Frequency distribution of select characteristics by case–control status
Variable | Patients (n=1024) | Controls (n=1118) | P-value* | ||
|---|---|---|---|---|---|
No. | (%) | No. | (%) | ||
Sex | 0.124 | ||||
Male | 723 | 70.6 | 755 | 67.5 | |
Female | 301 | 29.4 | 363 | 32.5 | |
Age (years) | 0.390 | ||||
⩽40 | 76 | 7.4 | 81 | 7.2 | |
41–50 | 202 | 19.7 | 203 | 18.2 | |
51–60 | 304 | 29.7 | 363 | 32.5 | |
61–70 | 349 | 34.1 | 389 | 34.8 | |
>70 | 93 | 9.1 | 82 | 7.3 | |
Smoking status a | <0.0001 | ||||
No | 396 | 38.7 | 590 | 52.8 | |
Yes | 628 | 61.3 | 528 | 47.2 | |
Pack-years value | <0.0001 | ||||
⩽27 | 220 | 35.0 | 313 | 59.3 | |
>27 | 408 | 65.0 | 215 | 40.7 | |
Histological type | |||||
Squamous-cell carcinoma | 417 | 40.7 | |||
Adenocarcinoma | 381 | 37.2 | |||
Othersb | 226 | 22.1 | |||
