Change in quality 1 January 1998 to 1 January 2005 for people with type 2 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 | 58.8 (7668) | 94.2 (12 060) | 35.4 (34.2 to 36.6) | <0.001 | Rapid rise before 2000 |
| Blood pressure measured | 61.1 (7668) | 87.0 (12 060) | 25.9 (24.6 to 27.1) | <0.001 | Rapid rise before 2000 |
| Cholesterol measured | 26.5 (7668) | 91.2 (12 060) | 64.7 (63.6 to 65.8) | <0.001 | Rapid rise before 2000 |
| Creatinine measured | 41.7 (7668) | 94.6 (12 060) | 52.9 (51.7 to 54.1) | <0.001 | Rapid rise before 2000 |
| Smoking recorded | 82.9 (7668) | 97.0 (12 060) | 14.1 (13.2 to 15.0) | <0.001 | Rapid rise before 2000 |
| Foot vascular status assessed | 47.2 (7668) | 74.7 (12 060) | 27.4 (26.1 to 28.8) | <0.001 | Slow continuous improvement |
| Foot neurological status assessed | 38.2 (7668) | 73.8 (12 060) | 35.6 (34.3 to 36.9) | <0.001 | Slow continuous improvement |
| Retinal screening | 66.7 (7668) | 75.8 (12 060) | 9.1 (7.8 to 10.4) | <0.001 | Improvement after redesign in 2003 |
| Glycated haemoglobin ⩽10% | 90.4 (4511) | 93.6 (11 365) | 3.2 (2.2 to 4.2) | <0.001 | Worse till 2001, improving since |
| Glycated haemoglobin ⩽7% | 42.9 (4511) | 48.5 (11 365) | 5.7 (4.0 to 7.4) | <0.001 | Worse till 2001, improving since |
| Systolic blood pressure ⩽140 mm Hg | 50.7 (4685) | 57.7 (10 489) | 7.0 (5.3 to 8.7) | <0.001 | Slow continuous improvement |
| Diastolic blood pressure ⩽80 mm Hg | 57.8 (4685) | 68.8 (10 489) | 10.9 (9.3 to 12.6) | <0.001 | Slow continuous improvement |
| Cholesterol ⩽5 mmol/l | 30.7 (2031) | 72.8 (11 000) | 42.0 (39.9 to 44.2) | <0.001 | Slow continuous improvement |
| Mean glycated haemoglobin (%) | 7.57 | 7.43 | −0.14 (−0.18 to −0.10) | <0.001 | Worse till 2001, improving since |
| Mean systolic blood pressure (mm Hg) | 144.6 | 140.3 | −4.3 (−4.8 to −3.9) | <0.001 | Slow continuous improvement |
| Mean diastolic blood pressure (mm Hg) | 81.2 | 76.1 | −5.1 (−5.3 to −4.8) | <0.001 | Slow continuous improvement |
| Mean cholesterol (mmol/l) | 5.61 | 4.60 | −0.9 (−1.02 to −0.96) | <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 = 0.00.