Table 5. Factor analysis of all GP views on clusters

Cluster item	Factor 1^a	Factor 2^a
Informed about cluster	0.808	0.229
Decisions reflect my views	0.828	0.243
PQL responsive to queries or concerns	0.688	0.157
Feel ‘ownership’ of cluster	0.813	0.251
Can influence cluster work	0.805	0.246
Quality planning	0.299	0.822
Quality improvement	0.270	0.862
Quality control	0.236	0.873
Local population needs	0.292	0.731
Quality of care	0.238	0.718
Shared decision making	0.080	0.707

Bartlett's test of sphericity = P<0.001.
KMO measure of sampling adequacy = 0.908.
PQL = practice quality lead.
^aHigh factor loadings identify a single construct, which means the items within it can be legitimately aggregated to give a total score.