Table.

Comparison of three methods of risk assessment for coronary heart disease among 37 general practitioners and 35^* practice nurses. Values in parentheses are approximate 95% confidence intervals

Test	Overall P value	New Zealand guidelines v Sheffield table			Joint British chart v Sheffield table			Joint British chart v New Zealand guidelines
		Median difference	P value		Median difference	P value		Median difference	P value
Doctors:
Accuracy	0.36	0 (−0.5 to 0.5)	0.48		0 (0 to 0.5)	0.34		0 (0 to 0.5)	1.00
Preference	<0.001	1.5 (1 to 2)	<0.001		1.5 (1 to 2)	<0.001		0 (−0.5 to 0.5)	0.66
Ease of use	<0.001	1.5 (1 to 2)	<0.001		1.5 (0.5 to 2)	<0.001		0 (−0.5 to 0.5)	0.63
Nurses:
Accuracy	0.002	1 (0.5 to 2)	<0.001		1.5 (0.5 to 2.5)	<0.001		0 (−0.5 to 0.5)	0.73
Preference	<0.001	2.5 (1.5 to 3)	<0.001		2 (1.5 to 2.5)	<0.001		0 (−0.5 to 1)	0.55
Ease of use	<0.001	2 (1 to 2.5)	<0.001		2 (1 to 2.5)	<0.001		0 (−0.5 to 1)	0.65

The overall P value is a Friedman test; the pairwise comparisons are Wilcoxon's signed rank tests on the median differences between matched pairs. 

^*34 for analyses of preference and ease of use (see text).