Table 2. Associations between clinical factors and serum RASSF1A methylation status.

Characteristic	Methylated no.	Unmethylated no.	Total no.	P-value
Age at diagnosis				0.002
<12 months	5	37	42
⩾12 months	12	14	26
Stage				<0.001
1/2/4S	3	36	39
3	3	8	11
4	11	7	18
MYCN				<0.001
Non-amplified	5	51	56
Amplified	12	0	12