Table 2.

Observed variables

Theoretical concept	Variable	Type	Dataset
Health literacy	Number of correct health literacy tests	5 point scale	ELSA W5
Education	Level of educational qualification	Categorical	ELSA W6
Technology	Frequency of using the internet	6 point scale	ELSA W6
Convenience	Proportion of people who found the appointment very or fairly convenient	Percent	GPPS
Ease at booking	Proportion of people who wound it very or fairly easy to get through to someone at the surgery	Percent	GPPS
Clear information	Proportion of people who know how to contact out of hours	Percent	GPPS
Obtaining an appointment	Proportion that were able to get appointment when needed	Percent	GPPS

ELSA English Longitudinal Study of Ageing, W5 wave 5, GGPS GP Patient Survey