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Table 4 Clinical characteristics of ME/CFS and correlations with handgrip strength

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

  Female Male
Bell Median Range n Median Range n
30 10–65 59 40 20–70 42
 Correlations r p type r p type
 Fmax1 0.2670 0.0409 lin 0.115 0.4682 lin
 Fmean1 0.1226 0.3551 non-lin 0.3255 0.0354 non-lin
 Fmean2 0.1444 0.2710 non-lin 0.3175 0.0405 non-lin
 Fatigue Ratio1 0.07946 0.5497 non-lin − 0.3995 0.0088 non-lin
 Fatigue Ratio2 − 0.211 0.0643 non-lin − 0.3624 0.0183 lin
PEM Median Range n Median Range n
37 9–46 35 34 21–46 35
Correlations r p type r p Type
 Fmean2 − 0.334 0.0499 non-lin − 0.1987 0.2526 non-lin
 Fatigue Ratio2 0.4040 0.0161 lin 0.34 0.0457 lin
Muscle Pain Median Range n Median Range n
8 0–10 50 6 1–10 39
 Correlations r p type r p Type
 Fmean2 − 0.3095 0.0287 lin − 0.1643 0.3175 lin
 Recovery Ratio − 0.282 0.0472 non-lin − 0.1542 0.3488 non-lin
COMPASS vasomotor Median Range n Median Range n
0 0–5 49 0 0–5 40
 Correlations r p Type r p Type
 Fmax1 − 0.2664 0.0643 non-lin − 0.3537 0.0251 non-lin
 Fmax2 − 0.3635 0.0102 non-lin − 0.4327 0.0026 non-lin
 Fmean1 − 0.3013 0.0354 non-lin − 0.3784 0.0161 non-lin
 Fmean2 − 0.3663 0.0096 non-lin − 0.5767 < 0.0001 non-lin
 Fatigue Ratio2 0.03817 0.7946 lin 0.4869 0.0014 lin
 Recovery Ratio − 0.1938 0.1821 non-lin − 0.628 < 0.0001 non-lin
SF-36 phys. funct Median Range n Median Range n
40 5–90 52 47.5 0–100 38
 Correlations r p Type r p Type
 Fmax2 0.1724 0.2217 non-lin 0.3474 0.0351 non-lin
 Fmean2 0.2326 0.0970 lin 0.3605 0.0284 lin
CK Median Range n Median Range n
67.5 15–229 48 90 29–447 33
 Correlations r p Type r p Type
 Fatigue Ratio2 0.3054 0.0348 lin − 0.1856 0.3092 lin
 Recovery Ratio − 0.2935 0.0429 lin − 0.1045 0.5691 lin
LDH Median Range n Median Range n
216 150–286 47 225.5 145–308 34
 Correlations r p Type r p Type
 Fatigue Ratio1 − 0.06696 0.6547 non-lin 0.3522 0.0411 non-lin
 Fatigue Ratio2 0.3630 0.0122 non-lin 0.2683 0.125 non-lin
 Recovery Ratio − 0.0336 0.8226 non-lin − 0.378 0.0275 non-lin
  1. Clinical parameters with significant correlations with HGS and HGS ratios. Pearson (lin) or Spearman (non-lin) correlation coefficients were calculated. Bold: significant correlations with p < 0.05