Table 3 Sensitivity analysis with univariable/multivariable Cox regression and PSM-adjusted Cox regression of the HR for surgery vs. no surgery for OS of stage IIB, IIIA, and IIIB SCLC

IIB–IIIB

0.66 (0.59–0.74)

 < 0.001

0.54 (0.48–0.61)

 < 0.001

0.71 (0.61–0.82)

 < 0.001

IIB

0.77 (0.64–0.92)

0.005

0.57 (0.46–0.70)

 < 0.001

0.74 (0.59–0.93)

0.010

IIIA

0.71 (0.59–0.85)

 < 0.001

0.53 (0.44–0.64)

 < 0.001

0.61 (0.49–0.77)

 < 0.001

IIIB

0.67 (0.46–0.96)

0.030

0.58 (0.40–0.84)

0.004

0.78 (0.49–1.26)

0.311