Table 2

Change in clinical quality scores 1998-2003

19982003
ConditionNo of patientsMean (SD) quality scoreNo of patientsMean (SD) quality scoreChange (95% CI) in scores, 1998 to 2003P value*Improvement (% maximum possible improvement)
Coronary heart disease (41 practices)73760.5 (23.1)48778.1 (18.7)17.6 (13.9 to 21.4)<0.00145
Asthma (42 practices)78560.1 (29.2)50470.3 (27.5)10.2 (4.6 to 15.8)0.00126
Diabetes (42 practices)77670.4 (21.7)50477.7 (18.5)7.3 (3.4 to 11.1)0.00125
  • * From regression analysis using patient level data, allowing for clustering of patients within practices.