Variation of global DNA methylation levels with age and in autistic children

Table 1 Global DNA methylation levels of different age groups

Age range	Number	Global DNA methylation (%, mean ± SD)	Pearson’s r ^a	p value^b
1–5	160	47.52 ± 17.51	0.040	0.614
6–10	93	49.41 ± 17.03	0.053	0.613
11–15	68	54.73 ± 16.69	0.055	0.658
16–20	207	60.10 ± 17.78	0.205	0.003
21–25	100	66.92 ± 17.78	0.029	0.775
26–30	188	54.11 ± 16.10	0.008	0.916
31–35	321	66.68 ± 17.95	−0.059	0.292
36–40	202	68.24 ± 15.96	0.127	0.073
41–45	112	71.09 ± 16.08	0.150	0.113
46–50	129	77.17 ± 14.13	0.138	0.120
51–55	92	79.22 ± 10.95	0.213	0.041
56–60	68	69.84 ± 20.02	−0.294	0.015
61–65	120	53.20 ± 22.13	−0.028	0.765
66–70	71	51.54 ± 24.41	−0.061	0.612
71–75	54	39.13 ± 17.18	−0.133	0.339
76–80	75	54.73 ± 16.69	−0.064	0.584
81–85	36	40.95 ± 15.27	−0.023	0.896
>85	20	39.78 ± 12.08	−0.073	0.758

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