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Correlation of single breath count test (SBCT) and neck flexion manual muscle testing. A. SBCT versus Myasthenia Gravis Foundation of America (MGFA) classification (Pearson coefficient -0.480, P<0.01), B. SBCT versus forced vital capacity (FVC) in milliliters (mL) (Pearson coefficient 0.554, P< 0.01), C. SBCT versus neck flexion (Pearson coefficient 0.519, P <0.01), D. Neck flexion versus forced vital capacity (FVC) in milliliters (mL) (Pearson coefficient 0.505, P =0.02)
