Table 4.

Multivariate analyses: Variables associated with the interim or final classification after reviewing prior mammograms.

A. MULTIVARIATE ANALYSES: VARIABLES ASSOCIATED WITH THE INTERIM CLASSIFICATION (STEP 2) AFTER REVIEWING PRIORS WITH INDEX IMAGES PRESENT.
VARIABLES & CLASSES	CLEARLY VISIBLE TUMOURS COMPARED TO NO OR MINIMAL SIGNS			CLEARLY VISIBLE TUMOURS COMPARED TO NO SIGNS
	ODDS RATIO	95% CONFIDENCE INTERVAL	p-VALUE	ODDS RATIO	95% CONFIDENCE INTERVAL	p-VALUE
Need of arbitration on prior images			0.005			0.001
No arbitration	1			1
Arbitration	4.85	(1.61–14.61)	0.005	16.65	(2.98–93.00)	0.001
Date of prior imaging			0.044			0.004
Earliest tertile	11.13	(1.39–88.93)	0.024	39.71	(3.43–459.09)	0.003
Intermediate tertile	5.75	(0.68–48.72)	0.109	12.30	(1.06–142.17)	0.045
Latest tertile	1			1
Image quality at the tumour side			0.510			0.220
Good	1			1
Not good	1.40	(0.52–3.78)	0.510	2.02	(0.66–6.20)	0.220
B. MULTIVARIATE ANALYSES: VARIABLES ASSOCIATED WITH THE FINAL CLASSIFICATION (STEP 3) AFTER REVIEWING PRIORS WITH INDEX IMAGES AND CLINICAL INFORMATION PRESENT.
VARIABLE & CLASSES	CLEARLY VISIBLE TUMOURS COMPARED TO NO OR MINIMAL SIGNS			CLEARLY VISIBLE TUMOURS COMPARED TO NO SIGNS
	ODDS RATIO	95% CONFIDENCE INTERVAL	p-VALUE	ODDS RATIO	95% CONFIDENCE INTERVAL	p-VALUE
Need of arbitration on prior images			0.001			0.001
No arbitration	1			1
Arbitration	5.72	(1.99–16.43)	0.001	12.24	(2.80–53.52)	0.001
Date of prior imaging			0.006			0.001
Earliest tertile	11.30	(2.30–55.46)	0.003	29.13	(4.40–193.06)	<0.001
Intermediate tertile	5.66	(1.11–28.81)	0.037	10.13	(1.53–67.12)	0.016
Latest tertile	1			1
Image quality at the tumour side			<0.001			<0.001
Good	1
Not good	4.41	(1.96–9.34)				<0.001