Table 1

Characteristics of the study participants at 7½ and 9½ years

7½ years
9½ years
Social class*
 Non-manual (professional, managerial, skilled professions)82.0%82.3%
 Manual (partly or unskilled occupations)18.0%17.7%
Home ownership*
 Rented accommodation14.5%12.5%
Car access*
Maternal education*
 A-level or above43.9%46.9%
 Certificate of secondary school/vocational/none22.5%19.7%
  • *These variables were derived from responses to a questionnaire completed by mothers during the antenatal period.