Table 1. General CpG island attributes.

	Methylation-prone (n = 15)		Methylation-resistant (n = 47)
Attribute	Mean ± SD*	Range	Mean ± SD*	Range	P value*
Length, bp	1,098.4 ± 586.0	473-2718	1,098.4 ± 630.7	228-3182	1.00
%C+G	69.6 ± 4.31	61.7-75.8	68.8 ± 4.99	57.7-78.9	0.57
CGo/CGe	0.87 ± 0.08	0.77-1.01	0.85 ± 0.08	0.66-1.01	0.29
Sp1 sites†	0.47 ± 0.64	0-2	0.70 ± 0.91	0-3	0.36

Sequences were analyzed by using the NEWCPGREPORT algorithm (http://www.uk.embnet.org/Software/EMBOSS) by using a sliding window of 200 bp and a step increment of 1.

^*Groups were compared by Student's t test.

^†Number of occurrences per sequence based on the consensus GRGGCRGGGW.