TABLE 2

Means and ITS Analysis of Trends Assessing the Impact of Follow-up Discharge Calls and Access to Medication Refill Claims on Asthma Revisits and Preventive Care Outcomes

Mean Baseline Period, n (%)Mean Intervention Period, n (%)Trend During Baseline Perioda (95% CI)Trend During Intervention Perioda (95% CI)Change in Trend per Mo Baseline to Intervention Periodb (95% CI)
Primary outcomen = 186n = 491
 Composite emergency or hospital revisit up to 90 d28 (15)41 (8)*+6 (−1 to 13)−5 (−12 to 3)−10 (−21 to 3)
Preventive care outcome measuren = 162n = 377
 ICS refill up to 90 d101 (62)215 (57)−2 (−5 to 1)+3 (−1 to 7)+5 (−2 to 13)
 Ambulatory visits up to 90 d106 (65)253 (67)+1 (−2 to 5)−1 (−5 to 2)−3 (−9 to 4)
  • The baseline period (January 2010 to September 2011) and intervention period (October 2011 to March 2014) were compared by using χ2. ITS with segmented regression was performed by using generalized linear mixed models to estimate trends. A “+” indicates an increasing trend or slope, and a “−” indicates a decreasing trend during the baseline or intervention period.

  • a Trend analyses assessing slope over time.

  • b A change in trend indicates a difference in the trend when comparing pre- versus postintervention. For example, during the intervention period, ICS refills had a nonsignificant increase of 5% month to month compared with the baseline period of −2%.

  • * P < .05.