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The magnitude of changes in asthma-related outcomes compared to the minimal clinically important difference for (A) FEV1; (B) PEF; (C) ACQ; (D) ACT for adults; (E) ACT for children; and (F) (P)AQLQ. The symbols (◦ = herbs, herbal mixtures and extracts; x = omega-3 LCPUFA; + = weight loss) represent individual studies, and the line (−) indicates the minimal clinically important difference. Reference numbers for individual studies are noted next to the corresponding symbol.
