Table 3 Discriminatory power for the Spitz, Bach, and LLP risk models, overall and stratified by smoking, age, and sex

					P -value
		Model	Area under the curve	Asymptotic 95% confidence interval	(1)	(2)
Overall		Spitz	0.69	0.66–0.71
		Bach	0.66	0.64–0.69	0.07
		LLP	0.69	0.67–0.71	0.61	0.02
Current smokers		Spitz	0.68	0.64–0.72
		Bach	0.65	0.60–0.69	0.02
		LLP	0.66	0.62–0.70	0.23	0.45
Former smokers		Spitz	0.70	0.67–0.73
		Bach	0.65	0.62–0.68	0.01
		LLP	0.70	0.67–0.73	0.71	<0.01
Age group (years)	Sex
<50	Women	Spitz	0.59	0.46–0.69
		Bach	0.62	0.49–0.72	0.63
		LLP	0.62	0.49–0.72	0.64	0.99
<50	Men	Spitz	0.70	0.58–0.78
		Bach	0.68	0.56–0.77	0.66
		LLP	0.67	0.56–0.76	0.65	0.96
⩾50	Women	Spitz	0.70	0.66–0.73
		Bach	0.65	0.61–0.69	0.05
		LLP	0.69	0.66–0.73	0.86	0.04
⩾50	Men	Spitz	0.68	0.64–0.71
		Bach	0.67	0.63–0.70	0.63
		LLP	0.70	0.67–0.74	0.13	0.09

Abbreviation: LLP=Liverpool Lung Project.
(1) P-value comparisons for the Spitz and Bach models and the Spitz and LLP models.
(2) P-value comparisons for the Bach and LLP models.
Bold values represent results still significant to the 5% level after using the Bonferroni method for multiple corrections.

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