. 2017 Apr 15;150:373–382. doi: 10.1016/j.neuroimage.2017.02.026

Table 1.

Participants' neonatal, socio-demographic characteristics and IQ, by group.

	VPT-N	VPT-PBI	Controls	Statistics
	(n=64)	(n=20)	(n=48)	Statistics
Gestational age, weeks^a	29.20	27.65	40.10	H=7.482
Gestational age, weeks^a	29.20	27.65	40.10	p=0.006
Birth weight, grams^a	1328.22	1060.25	3310.54	H=7.775
Birth weight, grams^a	1328.22	1060.25	3310.54	p=0.005
Males/Females	35/29	10/10	26/22	X²=2.423
Males/Females	35/29	10/10	26/22	p=0.659
Age at assessment^b	19.8 (1.24)	19.4 (0.68)	19.1 (1.24)	H=10.525
Age at assessment^b	19.8 (1.24)	19.4 (0.68)	19.1 (1.24)	p=0.005

SES^c				X²=5.292
SES^c				p=0.507
I-II	28 (43.8%)	9 (45%)	27 (7%)
III	25 (39.1%)	8 (40%)	12 (25%)
IV-V	9 (14.1%)	3 (15%)	9 (18.8%)
Unclassified	2 (3.1%)	0 (0%)	0 (0%)
Full scale IQ^d	96	98.47	105.81	H=11.828
Full scale IQ^d	(12.71)	(15.98)	(13.85)	p=0.003

VPT-N compared to VPT-PBI.

Information was missing for 1 control participant and 2 participants from VPT-N group. Statistically significant differences were found between the VPT-N and control groups (H=21.744, p=0.008).

Parental socio-economic status (SES) was measured by the Classification of Occupation (CO80, Her Mayesty’ Stationery Office, 1980), with I as the highest and V as the lowest socio-economic group.

Statistically significant differences were found between the VPT-N and control groups (H=−23.66, p=0.003).