Table 3.

HR (95% CI) derived from Cox proportional hazard models for predictors of mortality for unilateral cases^a

	Unadjusted	Model 1	Model 2	Model 3	Model 4
Predictor	HR (95% CI)	HR (95% CI)	HR (95% CI)	HR (95% CI)	HR (95% CI)
Lag time^b (month)	1.372 (0.846–2.227)	1.332 (0.856–2.071)	1.356 (0.857–2.146)	1.348 (0.840–2.162)	1.338 (0.862–2.078)
Maternal education		0.765^c (0.633–0.925)	0.782^d (0.637–0.960)	0.738^d (0.569–0.957)	0.732^d (0.567–0.944)
IIRC			^e,^f
St. Jude				6.77^f (2.75–16.66)
ISS					3.88^f (2.10–7.18)

↵^aOf 107 children with unilateral disease with lag time data, 103 were followed, 12 of these died; 88.35% censored.
↵^bNatural log transformed.
↵^cP < 0.01.
↵^dP < 0.05.
↵^eAll 12 deaths occurred in children with IIRC classification of “E”, resulting in an extremely large coefficient.
↵^fP < 0.0001.