Table 4. Univariate analysis of relapse.

Characteristic	Hazard ratio	95% CI	P-value
Age at diagnosis
<12 months	Reference
⩾12 months	12.5	2.8–55.3	<0.001
Sex
Male	Reference
Female	1.0	0.4–2.9	0.972
Stage
1/2/3/4S	Reference
4	14.3	4.0–51.0	<0.001
MYCN
Non-amplified	Reference
Amplified	7.2	2.6–20.0	<0.001
Serum RASSF1A
Unmethylated	Reference
Methylated	6.8	2.4–19.1	<0.001

CI=confidence interval.