Table 2 Association between CCI and baseline characteristic^a

Age, y

< 65

1

1

≥65

1.73 (0.93–3.22)

0.082

1.30 (0.66–2.55

0.451

Gender

Male

1

1

Female

1.40 (0.75–2.59)

0.291

2.02 (0.96–4.27)

0.065

Histology

Adenocarcinoma

1

1

Squamous

1.03 (0.55–1.90)

0.935

0.89 (0.43–1.83)

0.748

Cancer stage

IIIB

1

1

IV

1.31 (0.65–2.63)

0.444

1.09 (0.50–2.38)

0.827

Smoking status

Nonsmoker

1

1

Smoker

3.53 (1.82–6.87)

<0.001

4.12 (1.92–8.84)

<0.001

Performance status^b

1

1

1

2

2.37 (1.27–4.44)

0.007

2.22 (1.14–4.33)

0.019