Samples sizes required for condition level scores to achieve 90% confidence intervals of ±10 points on estimated pass rates
| No of cases with the condition required | No of cases with applicable indicators required | No of randomly selected cases required | Multiplication factor for PCT level scores* | |
|---|---|---|---|---|
| URTI = upper respiratory tract infections; UTI = urinary tract infections; HRT = hormone replacement therapy; PCT = Primary Care Trust. | ||||
| *The sample sizes (in the preceding three columns) can be multiplied by this value to obtain the samples required to derive quality scores at the PCT level. | ||||
| †Not computed as sample too small. | ||||
| Chronic conditions | ||||
| Acne | 60 | 17 | 3685 | † |
| Allergic rhinitis | 304 | 17 | 13526 | † |
| Asthma | 8 | 8 | 64 | 2.3 |
| Coronary artery disease | 8 | 8 | 233 | 1.3 |
| Depression | 14 | 14 | 155 | 1.3 |
| Diabetes | 7 | 7 | 342 | † |
| Dyspepsia/PUD | 17 | 17 | 196 | 1.0 |
| Hypertension | 12 | 12 | 127 | 2.4 |
| Osteoarthritis | 61 | 48 | 1071 | 1.0 |
| Acute conditions | ||||
| Acute childhood diarrhoea | 19 | 19 | 511 | 1.4 |
| Acute low back pain | 103 | 48 | 774 | 1.6 |
| Headache | 347 | 19 | 2391 | † |
| Otitis media | 14 | 14 | 334 | 1.6 |
| URTI – bronchitis | 217 | 41 | 5514 | † |
| URTI – rhinitis | 62 | 41 | 33085 | † |
| URTI – tonsillitis | 33 | 33 | 370 | 1.5 |
| UTI | 51 | 38 | 416 | 2.1 |
| Preventive care | ||||
| Cervical screening | 11 | 9 | 40 | 1.6 |
| Family planning | 20 | 20 | 357 | 1.9 |
| Influenza immunisation | 62 | 62 | 307 | 2.9 |
| HRT | 34 | 33 | 1052 | 1.0 |
| Pneumococcal immunisation | 37 | 37 | 231 | 8.3 |
| Hepatitis B immunisation | 37 | 37 | 11851 | † |