Table 1. Sociodemographic Characteristics of the Sample at Entry to the Study.

	Sibling play sample
Characteristic	(N = 110)
Note. % indicates percent of sample. +Completed secondary education (age 16).
Mother’s age in years at first birth, M (SD), range	29.17 (5.71), 16.09−40.38
Cultural identity: Welsh, English, Scottish, Irish	98.1%
Achieved 5 GCSEs A-C or equivalent+ or higher	84.5%
Married or cohabiting	90.9%
Social class (middle class)	62.7%
Participating child’s gender (female)	46.4%