TABLE 3.

Cox Proportional Hazard Regression Models for Progression to ICU-Level Care Adjusted for Age and Sex (N = 169)

Covariates	Adjusted Hazard Ratio (95% CI)	p	Concordance (se)
Duration of symptoms (d)	0.979 (0.901–1.064)	0.623	0.563 (0.067)
Ultrasound characteristics
Mean Lung Ultrasound Score	3.607 (1.274–10.215)	0.016	0.680 (0.064)
A-lines (% lung fields)	0.100 (0.015–0.686)	0.019	0.697 (0.064)
B-lines (% lung fields)	2.750 (0.452–16.712)	0.272	0.590 (0.064)
Consolidation (% lung fields)	19.181 (0.540–680.960)	0.105	0.601 (0.068)
Pleural effusion (% lung fields)	45.460 (2.181–947.701)	0.014	0.640 (0.069)
Any pleural line abnormalities (% lung fields)	10.157 (0.728–141.644)	0.085	0.657 (0.053)
Thick (≥ 0.5cm) pleural line (% lung fields)	10.726 (0.133–863.768)	0.289	0.639 (0.063)
Irregular pleural line (% lung fields)	15.408 (0.806–294.672)	0.069	0.655 (0.053)
Fragmented pleural line (% lung fields)	38.754 (0.648–2,318.788)	0.080	0.600 (0.066)
Clinical variables
Oxygen saturation (minimum value on day of ultrasound), %	0.911 (0.848–0.979)	0.011	0.670 (0.074)
Respiratory rate (maximum value on day of ultrasound), breaths/min	1.061 (1.019–1.105)	0.004	0.705 (0.064)
Heart rate, beats/min (maximum value on day of ultrasound)	1.001 (0.973–1.030)	0.927	0.550 (0.063)
Temperature (maximum value on day of ultrasound), °C	1.085 (0.559–2.107)	0.809	0.567 (0.063)
Temperature (minimum value on day of ultrasound), °C	1.069 (0.285–4.012)	0.921	0.569 (0.066)
WBC count (maximum value on day of ultrasound), × 109 cells/L	0.948 (0.827–1.087)	0.444	0.566 (0.072)
WBC count (minimum value on day of ultrasound), × 109 cells/L	0.952 (0.824–1.100)	0.508	0.555 (0.072)
SIRS (continuous)	1.301 (0.805–2.102)	0.282	0.571 (0.071)
SIRS, ≥ 2 points	1.114 (0.404–3.075)	0.834	0.553 (0.065)

SIRS = systemic inflammatory response syndrome.

Boldface values indicates statistical significance (p < 0.05).