Table 4.
Variation in the use of diagnoses within eight diagnostic groups at the 14 general practices. The mean % of all diagnoses is the mean of the 14 individual practice means.
| Field | ICPC codes for diagnosis grouping | Mean % of all diagnoses | Lower 95% CI | Upper 95% CI |
| Psychiatric conditions | P01-P29, P70-P99 | 13.2 | 10.2 | 16.2 |
| Back problems | L02, L03, L84-L86 | 5.1 | 4.0 | 6.3 |
| Hypertension | K86, K87 | 2.9 | 1.9 | 3.9 |
| Heart disease | K74-K80 | 2.6 | 1.6 | 3.7 |
| Diabetes | T90 | 2.0 | 1.3 | 2.7 |
| Asthma | R96 | 1.7 | 1.1 | 2.3 |
| Respiratory | R05, R09-R23, R70-R83, H71-H74 | 1.2 | 0.9 | 1.5 |
| Elevated cholesterol | T93 | 0.5 | 0.2 | 0.8 |
CI = Confidence interval ICPC = International Classification for Primary Care