. Author manuscript; available in PMC: 2021 Mar 1.

Published in final edited form as: J Allergy Clin Immunol Pract. 2019 Oct 14;8(3):965–970.e4. doi: 10.1016/j.jaip.2019.09.034

Table IV.

Association of asthma patient outcomes over 12 months of follow-up and their rate of portal usage.

a. Asthma control expected values at 0 and 12 months, by patient portal use.*
Patient group	n	Expected Value at 0 months	Expected Value at 12 months	Difference 0 to 12 months (95% CI†)
No Portal Use	131 (43.5%)	2.51	2.03	−0.48 (−0.76, −0.20)
Some Portal Use	170 (56.5%)	2.34	2.06	−0.29 (−0.58, −0.03)
Difference				+0.20 (−0.21,+0.57)
*Asthma control is measured by the Juniper Asthma Control Questionnaire.^{12, 10} 1.5 or greater is the accepted threshold for lack of control.¹⁰
†Percentile confidence intervals (CI) using 999 bootstrap re-samplings.
b. Quality-of-life expected values at 0 and 12 months, by patient portal use.*
Patient group	n	Expected Value at 0 months	Expected Value at 12 months	Difference 0 to 12 months (95% CI†)
No Portal Use	131 (44%)	3.51	4.10	0.58 (0.23, 0.92)
Some Portal Use	170 (56%)	3.74	4.26	0.51 (0.23, 0.78)
Difference				−0.07 (−0.50,+0.35)
*Quality of life is measured by the Mini Asthma Quality of Life Questionnaire.¹¹ This 15-item questionnaire has a 7-point response scale. The score is the mean of the item results. A 0.5 unit change in score is considered clinically meaningful
†Percentile confidence intervals (CI) using 999 bootstrap re-samplings.
Note: Higher scores indicate better quality of life. Positive changes reflect improvement.