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Table 4 Receiver-operating characteristic analysis of CFS, GST5m, ultrasound-derived measurements and add-on test for predicting DAH30

From: Preoperative rectus femoris muscle ultrasound, its relationship with frailty scores, and the ability to predict recovery after cardiac surgery: a prospective cohort study

 

Sensitivity

(95% CI)

Specificity

(95% CI)

Positive Likelihood Ratio

(95% CI)

Negative Likelihood Ratio

(95% CI)

AUROC

(95% CI)

Single frailty tests

 CFS > 4

50.0 (18.7–81.3)

94.2 (85.8–98.4)

8.62 (2.77–26.84)

0.53 (0.28–0.99)

0.76 (0.66–0.85)

 GST5m ≥ 6 s

81.5 (61.9–93.7)

63.5 (49.0–76.4)

2.23 (1.49–3.33)

0.29 (0.13–0.66)

0.73 (0.62–0.83)

 Muscle thickness (MTRFM) ≤ 1.40 cm

62.8 (46.7–77.0)

61.1 (43.5–76.9)

1.61 (1.01–2.58)

0.61 (0.38–0.97)

0.63 (0.51–0.73)

 Muscle cross-sectional area (CSARFM) ≤ 3.015 cm2

45.5 (16.7–76.6)

94.1 (85.6–98.4)

7.73 (2.45–24.4)

0.58 (0.34–1.00)

0.64 (0.52–0.74)

 Muscle echogenicity (EchoRFM) > 45.85 au

53.6 (33.9–72.5)

78.4 (64.7–88.7)

2.48 (1.33–4.65)

0.59 (0.39–0.90)

0.66 (0.55–0.77)

Add-on test

 GST5m + CSARFM

71.4 (29.0–96.3)

94.4 (86.4–98.5)

12.86 (4.45–37.16)

0.30 (0.09–0.98)

0.90 (0.81–0.95)

  1. Au Arbitrary units, AUROC Area under receiver-operating characteristic curve, CFS Clinical Frailty Scale, CSARFM Muscle cross-sectional area of the rectus femoris muscle, DAH30 Days (alive and) at home within 30 days of surgery, EchoRFM Muscle echogenicity of the rectus femoris muscle, GST5m 5-m gait speed test, MTRFM Muscle thickness of the rectus femoris muscle