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Table 2 Univariate analysis of muscle thickness, echo intensity and echo intensity standard deviation (SD) and z-scores, and area under the receiver operating characteristic curve (ROC–AUC)

From: Diagnostic accuracy of quantitative neuromuscular ultrasound for the diagnosis of intensive care unit-acquired weakness: a cross-sectional observational study

  No ICU-AW ICU-AW P value ROC–AUC (95% CI)
Thickness     
 BB thickness [mean cm (SD)] 2.6 (0.6) 2.2 (0.5) 0.002* 68.0 (55.4–80.7)
 FCR thickness [mean cm (SD)] 1.1 (0.2) 1.0 (0.2) 0.035* 64.5 (50.4–78.7)
 RF thickness [mean cm (SD)] 3.1 (0.9) 2.8 (0.8) 0.258 55.6 (41.8–69.4)
 TA thickness [mean cm (SD)] 2.2 (0.4) 2.1 (0.4) 0.558 54.3 (40.3–68.3)
Z-score thickness     
 BB z-score thickness [mean (SD)] 0.1 (0.6) −0.3 (0.5) 0.011* 66.7 (53.7–79.6)
 FCR z-score thickness [mean (SD)] −0.7 (1.2) −1.3 (0.9) 0.033* 65.5 (51.3–79.7)
 RF z-score thickness [mean (SD)] −0.5 (0.7) −0.6 (0.8) 0.656 53.2 (39.4–67.1)
 TA z-score thickness [mean (SD)] −0.4 (0.7) −0.4 (1.0) 0.818 51.3 (37.5–65.1)
Echo intensity     
 BB absolute echo intensity [mean gray scale level (SD)] 76.2 (14.1) 79.1 (16.4) 0.434 57.6 (44.0–71.3)
 FCR absolute echo intensity [mean gray scale level (SD)] 62.3 (12.6) 67.7 (13.6) 0.095 63.2 (49.6–76.9)
 RF absolute echo intensity [mean gray scale level (SD)] 77.2 (17.0) 83.9 (14.8) 0.094 60.2 (46.4–74.0)
 TA absolute echo intensity [mean gray scale level (SD)] 88.6 (12.4) 94.6 (12.1) 0.046* 60.8 (47.4–74.1)
Z-score echo intensity     
 BB z-score echo intensity [mean (SD)] 0.5 (1.4) 0.7 (1.9) 0.519 56.3 (42.8–69.9)
 FCR z-score echo intensity [mean (SD)] 1.4 (1.6) 1.9 (2.0) 0.207 59.2 (45.2–73.2)
 RF z-score echo intensity [mean (SD)] 1.0 (1.6) 1.6 (1.8) 0.137 58.7 (45.0–72.4)
 TA z-score echo intensity [mean (SD)] 1.0 (1.2) 1.5 (1.4) 0.118 59.4 (45.9–72.9)
Echo intensity SD     
 BB echo intensity SD [mean gray scale level(SD)] 29.0 (4.0) 28.5 (4.4) 0.585 53.3 (39.6–67.0)
 FCR echo intensity SD [mean gray scale level(SD)] 21.3 (3.1) 20.8 (3.9) 0.573 56.2 (42.2–70.2)
 RF echo intensity SD [mean gray scale level(SD)] 24.2 (3.3) 23.5 (3.5) 0.398 55.9 (42.0–69.8)
 TA echo intensity SD [mean gray scale level (SD)] 25.8 (3.6) 26.2 (3.9) 0.698 54.4 (40.5–68.3)
Z-score echo intensity SD     
 BB z-score echo intensity SD [mean (SD)] 0.3 (1.5) 0.1 (1.5) 0.746 53.3 (39.6–67.0)
 FCR z-score echo intensity SD [mean (SD)] 0.8 (1.4) 0.6 (1.7) 0.716 55.0 (41.0–69.1)
 RF z-score echo intensity SD [mean (SD)] 0.1 (1.6) 0.04 (1.4) 0.890 54.2 (36.9–65.5)
 TA z-score echo intensity SD [mean (SD)] −0.3 (1.1) −0.2 (1.4) 0.777 55.0 (41.1–68.9)
  1. BB biceps brachii, FCR flexor carpi radialis, RF rectus femoris, TA tibialis anterior
  2. P < 0.05