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. 2022 Mar 14;12(8):1943–1958. doi: 10.1007/s13346-022-01131-8

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© The Author(s) 2022, corrected publication 2022

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Fig. 2 — Correlation between T_2m and FEV₁ before (black circles) and after (white circles) chest physiotherapy. In both cases, the correlation is statistically significant (before: r_sp = 0.69, p = 0.006; after r_sp = 0.44, p = 0.044). The linear relation occurring between T_2m and FEV₁ is represented by solid line (before: T_2m(ms) = (20.5 ± 6.3) × FEV₁ – (609 ± 366)) and dashed line (after: T_2m(ms) = (18.1 ± 9.0) × FEV₁ – (193 ± 526))