Table 2

Internal reliability scores for PC PMOS domains

Domain	Pre CFA		Post CFA
	Items, n	Cronbach alpha*	Items, n	Average inter-item correlation
Access	6	0.68	4	0.30
Communication	12	0.86	6	0.84
External policy	2	0.40	No change
Information flow	5	0.36	4	0.47
Organisation care planning	5	0.10	3	0.25
Patient-related factors	7	0.66	2	0.71
Physical environment	2	0.43	No change
Referrals	2	0.46	No change
Task performance	7	0.68	3	0.38
Team factors	2	0.18	Domain deleted

Data were collected in 2017 in nine general practices within Greater Manchester, UK. A total of 490 patients were included in the study.
*Average inter-item calculated for scales with fewer than seven items.
CFA, confirmatory factor analysis; PC MOS, Primary Care Patient Measure of Safety.