Table 2 Cox proportional hazards model fitted to all t1 tumour patients (n = 618)

Age

Reference: 70 or under

Over 70

1.01 (0.73, 1.39)

0.97

Procedure (with time-varying coefficient)

Reference: lobectomy

Wedge, < 1.6 years post-op

1.26 (0.75, 2.11)

0.39

Wedge, ≥ 1.6 years post-op

3.14 (1.98, 4.99)

< 0.001

Sex

Reference: female

Male

1.64 (1.19, 2.25)

0.002

N stage

Reference: N0

N1/N2/NX

1.86 (1.30, 2.66)

< 0.001

Smoking

Reference: Current/Ex smoker

Never smoked

0.77 (0.40, 1.50)

0.45

Performance ECOG

Reference: Fully active

Light work only

0.94 (0.64, 1.39)

0.75

Mobile > 50%

0.55 (0.29, 1.04)

0.067

Limited/immobile

1.86 (0.74, 4.68)

0.19

ASA grade

Reference: Normal/healthy

Mild systemic disease

1.18 (0.80, 1.74)

0.39

Severe or life threatening

2.08 (1.28, 3.37)

0.003

FEV1 predicted

1.00 (0.99, 1.01)

0.77