Promoting risk reduction among young adults with asthma during wildfire smoke: A feasibility study.

The study was a feasibility trial and was not designed or powered for statistical comparisons between arms. It used a convenience sample recruited from university listservs, with limited racial and ethnic diversity, and asthma and medication use were self-reported. Participants were young adults with mild asthma and, on average, well-controlled asthma at baseline, so results may not apply to more severe asthma. Forty-five percent of participants could not be included in the clinical outcome analysis because measurements were outside the timing window or not taken within one day of each other. Only seven SSU participants were included in the clinical outcome analysis. The trial was unblinded, and participants knew their arm assignment. SSU-Plus features were not fully developed at the start, and app usage tracking began four weeks into the study. Spirometry technique could not be taught face-to-face. Follow-up was only eight weeks, and exposure periods varied. GPS permission was intermittent, location was assumed static between data points, and indoor air quality was not measured.

No conflicts-of-interest declaration is provided in the supplied text. The article is listed as NIH extramural research support, and a technology partner, Urbanova, developed or hosted app components.

Do not conclude that SSU-Plus improves asthma outcomes. This was a feasibility study, the control arm also had a significant increase in asthma control score, and SSU-Plus included several features at once, so the contribution of any single component cannot be separated. Lung function also decreased in that arm.