Table 2.

Socio-Demographic Characteristics of Adolescents

	Wave 14+ (n=6,140)	Wave 16+ (n=5,069)
Age in years, Mean (SD)	14.0 (0.19)	16.7 (0.24)
Gender, n (%):
Females	3,416 (55.5%)	3,059 (58.7%)
Males	2,742 (44.5%)	2,154 (41.3%)
Maternal education, n (%):
A-level or university degree	2,484 (40.3%)	2,209 (42.4%)
Up to GCSE	3,008 (48.8%)	2,366 (45.4%)
Missing	66 (10.8%)	638 (12.2%)
Child ethnicity, n (%):
Caucasian	5,372 (87.2%)	4,482(86.0%)
Other	111 (1.8%)	83 (1.6%)
Missing	675 (11.0%)	648 (12.4%)
Maternal parity, n (%):
Primiparae	2,620 (42.5%)	2,219 (42.6%)
Multiparae	2,889 (46.9%)	2,362 (45.3%)
Missing	649 (10.5%)	632 (12.1%)

Note: GCSE = general certificate of secondary education.