Table 1 Basic characteristics of subjects

Age (Years, Mean ± SD)

55.06 ± 11.33

55.07 ± 11.02

0.989^a

> 55

231(47.7%)

226 (46.4%)

 ≤ 55

253(52.3%)

261 (53.6%)

Gender, n (%)

0.799^b

Male

376(77.7%)

375 (77.0%)

Female

108(22.3%)

112 (23.0%)

Smoking, n (%)

0.051^b

Yes

238(49.2%)

234 (48.0%)

No

246(50.8%)

253 (52.0%)

Serum tumor marker levels ( Mean ± SE)

CEA (ng/mL)

14.79 ± 0.97

2.22 ± 0.07

˂ 0.001^a

AFP (ng/mL)

279.26 ± 124.32

3.19 ± 0.11

0.028^a

CA50 (U/mL)

8.33 ± 0.80

7.00 ± 0.29

0.118^a

CA125 (U/mL)

115.05 ± 15.93

10.29 ± 0.29

˂ 0.001^a

CA199 (U/mL)

54.39 ± 6.21

10.17 ± 0.40

˂ 0.001^a