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Table 2 Overall percent distributions of asthma indicators, 2006 to 2010

From: Quality of asthma care under different primary care models in Canada: a population-based study

  2006 2007 2008 2009 2010 2006 to 2010  
Asthma indicators % 95% CI % 95% CI % 95% CI % 95% CI % 95% CI % change 95% CI p-value for trend
Process-related indicators              
Use of spirometry              
 To diagnose asthma 46.8 (46.2, 47.5) 48.8 (48.1, 49.5) 49.9 (49.2, 50.7) 51.0 (50.3, 51.8) 52.5 (51.6, 53.5) 12.2 (10.3, 14.0) <0.001
 To monitor asthma 16.4 (16.2, 16.5) 17.0 (16.9, 17.2) 17.2 (17.1, 17.4) 17.7 (17.6, 17.9) 19.1 (18.9, 19.2) 16.5 (15.2, 17.8) <0.001
Asthma medication prescriptions (in patients ≥65 years old)         
Inhaled corticosteroids 72.9 (72.1, 73.7) 74.2 (73.3, 75.0) 74.7 (73.8, 75.5) 75.2 (74.4, 76.1) 76.6 (75.8, 77.5) 5.1 (4.3, 6.0) <0.001
Short acting β2-agonist 60.5 (59.7, 61.2) 60.7 (59.9, 61.4) 58.2 (57.4, 58.9) 57.8 (57.0, 58.5) 58.5 (57.8, 59.3) −3.3 (−4.3, −2.1) <0.001
 ≤4 canisters per year 56.6 (55.7, 57.6) 57.7 (56.7, 58.6) 60.5 (59.5, 61.5) 61.2 (60.2, 62.3) 61.6 (60.6, 62.7) 8.8 (7.3, 10.5) <.0001
 5-12 canisters per year 30.3 (29.6, 31.0) 30.4 (29.7, 31.1) 29.3 (28.6, 30.0) 29.0 (28.3, 29.7) 29.4 (28.7, 30.1) −3.0 (−5.5, −0.2) 0.0008
 13-20 canisters per year 8.7 (8.3, 9.1) 8.2 (7.9, 8.6) 7.3 (7.0, 7.7) 7.1 (6.8, 7.5) 6.5 (6.2, 6.9) −25.3 (−29.4, −20.0) <.0001
 >20 canisters per year 4.4 (4.1, 4.6) 3.7 (3.5, 4.0) 2.9 (2.7, 3.1) 2.7 (2.5, 2.9) 2.4 (2.2, 2.6) −45.5 (−50.5, −39.5) <.0001
Outcome-related indicators              
Asthma specific health services use              
 Primary care visits 20.8 (20.8, 20.9) 20.0 (19.9, 20.1) 18.4 (18.3, 18.5) 17.5 (17.4, 17.5) 17.1 (17.0, 17.1) −17.8 (−18.4, −17.7) <0.001
 Emergency department visits 2.4 (2.4, 2.4) 2.2 (2.2, 2.2) 1.9 (1.9, 1.9) 1.8 (1.8, 1.8) 1.7 (1.7, 1.7) −29.2 (−30.0, −27.9) <0.001
Other health services use              
 Primary care visits 86.2 (86.1, 86.4) 84.9 (84.8, 85.0) 83.4 (83.3, 83.6) 83.8 (83.7, 83.9) 83.1 (83.0, 83.2) −3.6 (−3.9, 3.4) <0.0001
 Emergency department visits 26.1 (26.0, 26.1) 25.9 (25.9, 26.0) 25.8 (25.7, 25.8) 25.7 (25.6, 25.8) 25.9 (25.8, 26.0) −0.8 (−1.1, 0.0) <0.0001
  1. Note: p-value is based on the Cochran-Armitage test for trend for multiple proportions.