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Table 5 Cutoff values for hand grip strength (Age 20–39, ME/CFS vs HC)

From: Hand grip strength and fatigability: correlation with clinical parameters and diagnostic suitability in ME/CFS

  Sex Cutoff Value AUC Sensitivity Specificity
Fmax1 Females  < 23.55 kg 0.8656 70 93.75
Males  < 33.35 kg 0.8762 68.42 94.12
Fmax2 Females  < 24.40 kg 0.9156 90 93.75
Males  < 36.55 kg 0.9025 78.95 88.24
Fmean1 Females  < 19.74 kg 0.9188 80 100
Males  < 29.36 kg 0.8947 73.68 94.12
Fmean2 Females  < 19.95 kg 0.9438 85 100
Males  < 28.76 kg 0.9071 68.42 100
Fatigue Ratio1 Females  > 1.161 0.8500 75 87.5
Males  > 1.197 0.5325 36.84 100
Fatigue Ratio2 Females  > 1.200 0.8563 65 93.75
Males  > 1.189 0.5728 36.84 94.12
Recovery Ratio Females  < 0.914 0.7906 70 93.75
Males  < 1.125 0.5820 100 23.53
  1. Results of ROC-Analysis for males and females aged 20–39 years. ME/CFS patients (females n = 20, males n = 19) and HC (females n = 16, males n = 17). Bold: most distinct parameter