Table 3

Analysis of survival of lung cancer patients in relation to the geographically based propensity to use surgical resection

A) Surgical resection
Geographical quintile of surgical resection		Adjusted for age and sex		Adjusted for age and sex and restricted to stage I and II patients
Geographical quintile of surgical resection		HR	95 % CI	HR	95 % CI
1	Lowest	1.00		1.00
2		0.96	0.94 to 0.97	0.91	0.85 to 0.96
3		0.92	0.91 to 0.94	0.89	0.84 to 0.94
4		0.90	0.88 to 0.91	0.82	0.77 to 0.86
5	Highest	0.84	0.83 to 0.86	0.80	0.75 to 0.84
χ²(one df)		456.7		74.2
P for trend		<0.001		<0.001