	Blood pressure ≤150/90 mmHg (n = 7450)		Total cholesterol ≤5mmol/l (n = 7449)

Clinical indicator	β	SE(β)	β	SE(β)
Characteristic
Intercept	85.554	0.560	69.507	0.979

Area
Density (people per hectare 2001)	–0.153	0.123	–0.193	0.203
Index of Multiple Deprivation	–0.439^c	0.102	–0.148	0.177

Patients
≥65 years of age	–0.328^a	0.144	–0.781^b	0.249
% Member of racial or ethnic minority	–0.184	0.153	0.295	0.253

Disease prevalence
Unadjusted prevalence	0.235	0.140	0.868^c	0.220

Practice
Size of practice population	–0.331^c	0.095	–0.287^a	0.134
List size per FTE GP	–0.036	0.077	–0.124^b	0.046
Single-handed practice	0.830^a	0.335	0.416	0.472
Primary medical services contract	–0.285	0.180	–0.103	0.297

GPs
≥45 years of age	–0.245^a	0.110	–0.399^c	0.153
% Female GPs	0.099	0.107	0.542^c	0.150
% GPs qualified in UK	0.137	0.130	1.176^c	0.214

Exception reporting
Blood pressure recorded	0.423^c	0.111
Blood pressure ≤150/90 mmHg	1.213^c	0.160
Total cholesterol recorded			–0.105	0.154
Total cholesterol ≤5 mmol/l			5.488^c	0.182

Practice nurses
List size per FTE practice nurse (quintiles)
1st ≤3038.01	–0.744	0.611	2.478^b	0.969
2nd 3038.02–3901.48	–0.761	0.606	2.045^a	0.979
3rd 3901.49–4823.44	–0.659	0.576	2.882^b	1.003
4th 4823.45–6210.68	–0.646	0.595	2.053^a	1.003
5th ≥6210.69	–0.547	0.605	2.580^b	0.986
No practice nurse	0.000		0.000

Global test for effect of nurse staffing –2 log likelihood (IGLS)
Model without practice nurse variable	51373.121		56880.242
Model with practice nurse variable	51371.082		56863.805
Difference in log likelihood (5df)	2.039		16.437
P-value	0.84		0.0057

Variance
PCT level	2.251	0.283	10.125	1.207
Practice level	39.551	0.963	81.485	2.339

df = degrees of freedom. FTE = full-time equivalent. SE = standard error..
↵a P<0.05;
↵b P<0.01;
↵c P<0.001.