Very interesting stuff, given the massive size of the study.
Long-term use of Chinese herbal medicine therapy reduced the risk of asthma hospitalization in school-age children: A nationwide population-based cohort study in Taiwan – ScienceDirect
Read on www.sciencedirect.com/science/article/pii/S2225411018304358
Children older than 6 years who used CHM therapy for more than 180 days exhibited a reduction of 29% for the risk of consequent asthma hospitalization (aHR: 0.71, 95% CI: 0.51–0.98).