Table 3.

 Process of care for patients with asthma based on clinical records before and after introduction of computerised decision support system

	Computerised system (n=1200)	Controls (n=1163)	Odds ratio (95% CI)
No of patients consulting during intervention period	1129	1101
Mean (SD) No of consultations during intervention period	6.7 (6.3)	6.8 (5.8)	1.01* (0.92 to 1.11)
Mean (SD) No of consultations for asthma	1.5 (2.3)	1.6 (2.2)	0.94* (0.81 to 1.08)
No (%) of patients consulting before and after intervention period
Lung function assessed:
All patients	516 (43); 511 (43)	492 (42); 517 (45)	0.94 (0.67 to 1.33)
Patients who consulted	515 (45); 510 (45)	491 (45); 516 (47)	0.94 (0.66 to 1.34)
Compliance checked:
All patients	426 (36); 442 (37)	446 (38); 471 (41)	0.82 (0.58 to 1.15)
Patients who consulted	425 (37); 441 (39)	445 (40); 470 (43)	0.82 (0.58 to 1.16)
Inhaler technique assessed:
All patients	203 (17); 224 (19)	234 (20); 262 (23)	0.8 (0.5 to 1.28)
Patients who consulted	203 (18); 224 (20)	233 (21); 262 (24)	0.81 (0.5 to 1.28)
Asthma education, action plan, or both:
All patients	79 (7); 60 (5)	108 (9); 78 (7)	0.84 (0.4 to 1.74)
Patients who consulted	79 (7); 60 (5)	108 (10); 78 (7)	0.81 (0.39 to 1.67)
Smoking status known:
All patients	285 (24); 370 (32)	305 (26); 367 (32)	0.97 (0.65 to 1.45)
Patients who consulted	285 (25); 369 (33)	303 (28); 367 (33)	0.98 (0.66 to 1.46)
Smoking cessation advice or nicotine replacement therapy:
All patients	57 (5); 81 (7)	68 (6); 103 (9)	0.75 (0.45 to 1.26)
Patients who consulted	57 (5); 81 (8)	68 (6); 103 (9)	0.76 (0.46 to 1.27)

^*Effect size; see footnote to table 2.