Table 5

Significant multivariable predictors, 2007/8

VariableIRR (95% CI)% Changep Value
Practice deprivation score1.016 (1.012 to 1.02)1.6%<0.0001
Distance from hospital (miles)0.99 (0.985 to 0.995)−1.0%0.0001
Size of practice (no of patients)0.99999 (0.9998 to 0.999999)−0.001%0.0001
Age (% of practice patients aged 65+ years)1.03 (1.02 to 1.04)3.0%<0.0001
% of Practice white ethnicity1.003 (1.001 to 1.005)0.3%<0.0001
% of Practice male0.98 (0.96 to 0.99)−2.0%0.004
% Able to book with a specific GP0.995 (0.991 to 0.998)−0.5%0.0006
Backward stepwise evictionsp Value when removed from model
% Able to book 2 days ahead0.95
% Response rate to access survey0.69
Total QOF organisational points0.63
Total QOF clinical points0.74
% Satisfied with phone access0.48
% Satisfied with opening hours0.24
% Able to get appointment in 48 h0.06
  • N=145 for all variables.

  • Final multivariable model after backward selection process has been implemented for level 2 variables. Figures in the second column are incident rate ratios (IRR). Subtracting 1 from the IRR and then multiplying by 100 gives the percentage change in the expected admissions count for a 1 unit increase in the predictor. So for practice deprivation score, for every extra deprivation point, the expected admissions count increases by 1.6%. IRR less than 1.0 represent decreases and IRR greater than 1.0 represent increases in the count. Statistical model: negative binomial regression, using log of list size as the offset.

  • GP, general practitioner; QOF, Quality and Outcomes Framework.