Table 6 List of variables used in the analysis
Socio-demographic variables (at or during pregnancy)
Two dummies for housing tenure which take the value 1 if the
mother owned the house or rented the house during pregnancy
(omitted category is social housing); the number of rooms in
the house during pregnancy; neighborhood indicators with
higher values indicating a better neighbourhood; a dummy
indicating the mother’s race (white, with omitted category
nonwhite); three dummies indicating the marital status of the
mother at the time of pregnancy (married, cohabiting, single/
separated/divorced); five dummies indicating the mother’s and
father’s education level (university degree; A levels (school
qualifications obtained at age 18); O levels (school
qualifications obtained at age 16); CSE (a lower level of school
qualifications obtained at age 16) and vocational); and an
indicator variable that takes the value 1 if the mother was
working at 18 weeks of pregnancy.