Table 4.
Estimated incident rate ratios, associated 95% CIs and associated p values for negative binomial regression for premature (U75) CHD mortality count
| Explanatory variable | IRR | 95% CI | p Value | Effect of a 1% increase in explanatory variable on percentage change in premature mortality (CI) | |
|---|---|---|---|---|---|
| Percentage of White patients | 1.008 | (1.003 to 1.012) | 0.002 | +0.8% | (0.3 to 1.2) |
| Deprivation score | 1.017 | (1.011 to 1.024) | <0.001 | +1.7% | (1.1 to 2.3) |
| Prevalence of diabetes in 2006/2007 | 1.114 | (1.028 to 1.208) | 0.009 | +11.4% | (2.8 to 20.8) |
| Percentage over 65 | 1.059 | (1.038 to 1.081) | <0.001 | +5.9% | (3.8 to 8.1) |
| Percentage of male patients | 1.067 | (1.038 to 1.103) | <0.001 | +6.7% | (3.8 to 10.3) |
| Number of GPs/1000 patients | 1.197 | (0.885 to 1.619) | 0.244 | +19.7% | (−11.5 to 61.9) |
| Hypertension detection in 2006/2007 | 0.978 | (0.950 to 1.007) | 0.133 | −2.2% | (−5.0 to 0.7) |
| Percentage of patients offered smoking cessation advice (SM02) | 1.002 | (0.993 to 1.011) | 0.712 | +0.2% | (−0.7 to 1.1) |
| Percentage of serum cholesterol (CHD08) | 0.991 | (0.981 to 1.000) | 0.044 | −0.9% | (−1.9 to 0.0) |
| Percentage of aspirin (CHD09) | 1.002 | (0.982 to 1.022) | 0.884 | +0.2% | (−1.8 to 2.2) |
| Percentage of patients with recalled perception of being able to see preferred GP | 0.994 | (0.989 to 1.00) | 0.036 | −0.6% | (−1.1 to 0.0) |
Also included are the effects on premature CHD mortality count of a unit increase in the value of the explanatory variables.
*One unit on scale for deprivation score.
CHD, coronary heart disease; GP, general practitioner.