Table 3.

Collapse of demographic characteristics for statistical analysis

Ethnicity	Ethnicity was collapsed into ‘Caucasian’ (including only ‘Caucasian’ category) and ‘Non‐Caucasian’ (including ‘Asian’, ‘Black’, ‘Chicana’, and ‘Mixed’ categories)
Educational qualifications	Educational qualifications was collapsed into ‘A levels and below’ (including ‘no formal qualification’, ‘primary’, ‘secondary’, and ‘A levels’ categories) and ‘Diploma and above’ (including ‘diploma’, ‘degree’, post‐graduate’, and ‘other’ categories)
Relationship status	Relationship status was collapsed into ‘Single’ (including ‘single’, ‘separating’, ‘divorced’, and ‘widowed’ categories) and ‘In a relationship’ (including ‘dating’, long‐term relationship, ‘cohabiting’, and ‘married’ categories)
Employment situation	Employment situation was collapsed into ‘Employed’ (including ‘paid’, ‘unpaid’, ‘on sick leave’, and ‘other’ categories) and ‘Unemployed’ (including only ‘unemployed’ category)