Change in quality 1 January 1998 to 1 January 2005 for people with type 1 diabetes
| Indicator* | Achieving measure 1/1/98, % (n) | Achieving measure 1/1/05, % (n) | Difference 1998–2005 (95% CI) | p Value# | Pattern of change (see web-only figures 1–8) |
| Glycated haemoglobin measured | 58.2 (1178) | 91.2 (1471) | 33.0 (29.8 to 36.2) | <0.001 | Rapid rise before 2000 |
| Blood pressure measured | 50.8 (1178) | 77.3 (1471) | 26.5 23.0 to 30.1) | <0.001 | Rapid rise before 2000 |
| Cholesterol measured | 20.0 (1178) | 71.0 (1471) | 51.0 (47.8 to 54.3) | <0.001 | Rapid rise before 2000 |
| Creatinine measured | 31.4 (1178) | 79.1 (1471) | 47.7 (44.3 to 51.0) | <0.001 | Rapid rise before 2000 |
| Smoking recorded | 77.6 (1178) | 93.5 (1471) | 15.9 (13.2 to 18.6) | <0.001 | Rapid rise before 2000 |
| Foot vascular status assessed | 35.5 (1178) | 61.7 (1471) | 26.2 (22.5 to 29.9) | <0.001 | Slow continuous improvement |
| Foot neurological status assessed | 28.5 (1178) | 60.8 (1471) | 32.3 (28.7 to 35.9) | <0.001 | Slow continuous improvement |
| Retinal screening | 57.3 (1178) | 74.2 (1471) | 16.9 (13.1 to 20.5) | <0.001 | Improvement after redesign in 2003 |
| Glycated haemoglobin ⩽10% | 77.7 (686) | 78.4 (1345) | 0.7 (−3.1 to 4.5) | 0.72 | Worse till 2001, improving since |
| Glycated haemoglobin ⩽7% | 13.6 (686) | 12.2 (1345) | −1.3 (−4.4 to 1.8) | 0.39 | Worse till 2001, improving since |
| Systolic blood pressure ⩽140 mm Hg | 78.4 (598) | 72.2 (1144) | −6.2 (−10.4 to −2.0) | 0.005 | Recent deterioration |
| Diastolic blood pressure ⩽80 mm Hg | 75.4 (598) | 74.0 (1144) | −1.5 (−5.7 to 2.8) | 0.51 | No significant change |
| Cholesterol ⩽5 mmol/l | 43.2 (236) | 60.3 (1078) | 17.1 (10.1 to 24.0) | <0.001 | Slow continuous improvement |
| Mean glycated haemoglobin (%) | 8.75 | 8.88 | 0.13 (0.02 to 0.24) | 0.008 | Worse till 2001, improving since |
| Mean systolic blood pressure (mm Hg) | 129.4 | 132.4 | 3.0 (1.7 to 4.3) | <0.001 | Recent deterioration |
| Mean diastolic blood pressure (mm Hg) | 76.2 | 75.1 | −1.1 (−1.8 to −0.4) | 0.001 | Slow continuous improvement |
| Mean cholesterol (mmol/l) | 5.28 | 4.85 | −0.43 (−0.51 to −0.35) | <0.001 | Slow continuous improvement |
*Process measures, percentage of patients with record of process in previous 12 months; intermediate outcome measures, percentage of patients with measurement in last 12 months achieving target value.
#Bonferroni corrected threshold for significance, p = 0.003.