Table 2.

Reduced list of relevant explanatory variables grouped by justification, and the choice of one representative variable from each group for subsequent models

grouped candidate variables	justification / theory	representative variable
1
degree educated	post-industrial / knowledge-economy /	degree educated
professional occupations	peripherality
2
younger adults	life outcomes /	health not good
health not good	young people
3
english-speaking	ethnic / cultural diversity /	white
single-ethnicity	values
white
christian