Table 1.

Demographic Characteristics for the Children and Their Parents

	Less than 3-mm head motion (n=84)	Greater than 3-mm head motion or poor registration (n=104)	p-Value
Age at MRI (years)	7.1±0.58	7.0±0.53	n.s.
Gender (males/females)	43/42	52/52	n.s.
Handedness (right/left/mixed)	79/5/0	95/8/1	n.s.
Nonverbal IQ	102±14	101±13	n.s.
Ethnicity
Dutch or Western	57	56	n.s.
Non-Dutch/Non-Western	28	47
Family income
<1,200 euro/month	12	22	n.s.
1,200 to 2,400 euro/month	21	28
>2,400 euro/month	52	53
Maternal educational level (%)
Primary	14	20	n.s.
Secondary	53	65
Higher	18	18
Maternal age at intake	30.5±5.0	29.3±5.3	n.s.
Maximum head displacement (mm)	1.5±0.70	14.7±15.9	n.a.

p-Values were obtained using two sample t-tests for continuous variables and chi-square for categorical variables.

MRI, magnetic resonance imaging; n.s., not significantly different; n.a., not applicable as this variable was used to separate the groups.