Table 2. Overall survival and median survival of 1522 lung cancer patients stratified by treatment interval from surgery to chemotherapy.

Characteristic	Group 1(n = 153)	Group 2(n = 261)	Group 3(n = 290)	Group 4(n = 818)	p
Overall survival rate					<0.0001
One-year	0.88 (0.82–0.92)	0.88 (0.84–0.92)	0.87 (0.83–0.91)	0.80 (0.77–0.83)
Three-year	0.57 (0.48–0.64)	0.64 (0.58–0.70)	0.65 (0.58–0.70)	0.50 (0.46–0.53)
Five-year	0.41 (0.31–0.5)	0.48 (0.41–0.55)	0.50 (0.43–0.57)	0.35 (0.31–0.39)
Median survival (months)	44.50 (34.70–61.30)	59.53 (44.63–86.06)	67.33 (50.33–76.83)	36.33 (32.17–42.77)	<0.0001