Table 1.

Participant characteristics by intervention and control groups

	Intervention				Control
	Full-time employment	Part-time employment	Not in employment	Information not provided	Full-time employment	Part-time employment	Not in employment	Information not provided
Mother’s employment	3 (50.00)	2 (33.33)	0 (–)	1 (16.67)	2 (33.33)	2 (33.33)	2 (33.33)	0 (–)
Father’s employment	4 (66.67)	1 (16.67)	0 (–)	1 (16.67)	4 (66.67)	0 (–)	1 (16.67)	1 (16.67)
	Degree	A-level	GCSEs	Information not provided	Degree	A-level	GCSEs	Information not provided
Highest mother’s educational attainment	5 (83.33)	0 (–)	0 (–)	1 (16.67)	3 (50.00)	1 (16.67)	1 (16.67)	1 (16.67)
	Females	Males	Total		Females	Males	Total
Infant’s sex	2 (33.33)	4 (66.67)	6		2 (33.33)	4 (66.67)	6
	Mean	SD	Total		Mean	SD	Total
Gestational age (weeks)	29.2	1.09	5		30	1.09	6
Birth weight (g)	1313.25	338.46	5		1378.60	332.13	6
Days in NICU	57.6	20.95	5		69.8	62.83	5
APGAR (5 min)	4.33	4.16	3		8.5	0.71	2
Age (months): pre-test	11.90	0.79	5		13.04	1.21	6
Age (months): post-test	12.95	0.78	5		14.43	1.01	5
Mullen cognitive T scores at pre-test	94.40	11.46	5		92.67	14.85	6