Monitoring the prevalence of chronic conditions: which data should we use?

Table 2 Variance in standardised morbidity ratios between doctor’s lists by data source

		Mean	Variance	Interquartile range	Homoscedasticity
					PHC Dx vs. All Dx	All Dx vs. Dx + Rx
Hypertension	PHC Dx	1.02	0.15	0.46
	All Dx	1.02	0.11	0.41	0.0009	0.0001
	Dx + Rx	1.01	0.04	0.20
Lipid metabolism disorder	PHC Dx	1.00	0.26	0.61
	All Dx	1.00	0.22	0.57	0.0438	0.0001
	Dx + Px	0.99	0.08	0.34
Depression	PHC Dx	1.00	0.54	0.91
	All Dx	1.00	0.44	0.81	0.0057	0.0001
	Dx + Rx	1.00	0.10	0.36
Asthma	PHC Dx	1.01	0.31	0.67
	All Dx	1.01	0.28	0.66	0.2547	0.0001
	Dx + Rx	1.01	0.12	0.42
Diabetes	PHC Dx	1.02	0.15	0.49
	All Dx	1.02	0.13	0.45	0.0252	0.0001
	Dx + Rx	1.01	0.07	0.34
Osteoporosis	PHC Dx	1.00	0.38	0.74
	All Dx	1.00	0.33	0.69	0.1063	0.0001
	Dx + Rx	0.98	0.09	0.35
Chronic heart failure	PHC Dx	1.04	0.58	0.90
	All Dx	1.03	0.29	0.68	0.0001	0.0001
	Dx + Rx	1.02	0.10	0.37
Hypothyroidism	PHC Dx	0.99	0.41	0.81
	All Dx	1.00	0.39	0.78	0.4667	0.0001
	Dx + Rx	1.01	0.17	0.51
Malignant neoplasm	PHC Dx	1.00	0.19	0.57
	All Dx	1.00	0.12	0.46	0.0001	0.0001
	Dx + Rx	1.00	0.07	0.33
Glaucoma	PHC Dx	1.02	0.51	0.87
	All Dx	1.01	0.46	0.81	0.1693	0.0001
	Dx + Rx	0.99	0.13	0.37
Migraine	PHC Dx	1.00	0.40	0.74
	All Dx	1.00	0.39	0.74	0.5502	0.0001
	Dx + Rx	1.00	0.20	0.52
Parkinson´s disease	PHC Dx	1.02	0.68	1.03
Parkinson´s disease	All Dx	1.02	0.57	0.93	0.0137	0.0001
	Dx + Rx	1.01	0.29	0.57

PHC = Primary Health Care; All Dx = PHC diagnoses + Hospital DDS; Dx + Rx = PHC diagnoses + Hospital DDS + PHC prescriptions.

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