Similar DNA methylation levels in specific imprinting control regions in children conceived with and without assisted reproductive technology: a cross-sectional study

Table 1 Descriptive statistics by study group

Variable	ART group n = 67	SC group n = 31^a	P-value
Maternal Characteristics	n (%)	n (%)
Race
White	64 (95.5)	27 (90.0)	0.37^b
Non-white	3 (4.5)	3 (10.0)
Education
< College degree	10 (14.9)	10 (33.3)	0.10^b
College degree	26 (38.8)	11 (36.7)
Advanced degree	31 (46.3)	9 (30.0)
Household income
< 40 K	4 (6.0)	7 (23.3)	0.02^b
40 K- < 80 K	18 (26.9)	10 (33.3)
80 K +	45 (67.2)	13 (43.3)
Age at child's birth
Mean (SD)	34.1 (3.9)	29.6 (4.3)	< 0.001^c
Time to pregnancy
Not trying			9 (31.0)
< 12 months			18 (62.1)
≥ 12 months			2 (6.9)
Child Characteristics	n (%)	n (%)
Sex
Female	32 (47.8)	13 (43.3)	0.83^b
Male	35 (52.2)	17 (56.7)
Plurality
Singleton	44 (65.7)	30 (100.0)	< 0.001^b
Twins+	23 (34.3)	0 (0.0)
Year of birth
2005	7 (10.4)	9 (30.0)	0.11^b
2006	23 (34.3)	8 (26.7)
2007	23 (34.3)	10 (33.3)
2008	14 (20.9)	3 (10.0)
Birth weight (grams)
mean (SD)	3005.57 (790.9)	3458.1 (701.9)	0.008^c
Age (years)
mean (SD)	2.5 (0.97)	3.0 (1.00)	0.02^c

ISSN: 1471-2431