Table 4 Multivariate Cox regression analysis looking at the influence of surgery on overall survival since the introduction of the NLCA

From: Lung cancer survival in England: trends in non-small-cell lung cancer survival over the duration of the National Lung Cancer Audit

Year Total number of patients ( n) Proportion of patients who had surgery (%) Adjusted HR (95% CI) a
Group 1 = PS 0/1/2 and stage IA–IIB
2004/2005 1098 49 0.30 (0.26–0.36)
2006 1206 50 0.34 (0.29–0.40)
2007 1567 54 0.37 (0.32–0.42)
2008 2038 56 0.32 (0.28–0.37)
2009 3166 57 0.31 (0.27–0.35)
Group 2 = PS 0/1/2 and stage IIIA
2004/2005 496 18 0.44 (0.34–0.59)
2006 609 13.3 0.39 (0.30–0.52)
2007 746 15 0.40 (0.31–0.52)
2008 926 20 0.46 (0.37–0.56)
2009 1387 18 0.40 (0.33–0.49)
  1. Abbreviations: CI=confidence interval; HR=hazard ratio; PS=performance status.
  2. HRs compared with those who did not receive surgery the same year.
  3. aAdjusted for sex, age, PS, stage, ethnicity, co-morbidity and source of referral.