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. Author manuscript; available in PMC: 2024 Jul 11.
Published in final edited form as: J Anesth Transl Med. 2024 May 8;3(2):36–44. doi: 10.1016/j.jatmed.2024.05.001

Table 2.

Accelerated failure time model estimates for length of stay for echocardiographic parameters, log troponin, and log BNP.

Variable TR 95% CI
LB		 UB P value b a P value
LV ejection fractionb, % 1.007 0.98 1.034 .61 0.751 .08
LV volumec, mL 1.003 0.993 1.012 .85 0.717 .09
LA volumec, mL 0.994 0.975 1.013 .52 0.811 .32
RV diameterc, cm 1.022 0.642 1.625 .93 0.808 .27
RA volumec, mL 1.006 0.987 1.025 .56 0.774 .19
Ascending aorta sizec, cm 0.297 0.06 1.464 .14 0.703 .29
Peak E-wavec, m/s 0.838 0.647 1.085 .73 0.756 .13
TV TAPSEc 1.022 0.964 1.083 .47 0.768 .19
Estimated RVSPc, mmHg 0.953 0.909 1.000 .051 0.707 .12
Estimated RAPc, mmHg 1.012 0.902 1.134 .84 0.791 .24
MV E’ Lateral Velocityc, m/s 1.013 0.979 1.048 .47 0.718 .07
MV E/E’ Lateralc 1.035 0.914 1.172 .59 0.795 .26
Troponind, log ng/mL 1.162 0.951 1.142 .14 0.721‡ .037
BNPe, log pmol/L 1.062 0.609 1.852 .83 0.731 .06

Abbreviations: TR, time ratio; CI, confidence interval; LB, 95% confidence interval lower bound; UB, 95% confidence interval upper bound; LV, left ventricle; LA, left atrium; RV, right ventricle; RA, right atrium; TV, tricuspid valve; TAPSE, tricuspid annular plane systolic excursion; RVSP, right ventricle systolic pressure; RAP, right atrial pressure; MV, mitral valve.

a

b is the scale parameter forthe log-logistic distribution. The shape parameter is calculated as 1/b.

b

Time ratio represents changes in length of stay due to a decrease in one unit.

c

Time ratio represents changes in length of stay due to an increase in one unit.

d

Time ratio represents changes in length of stay due to a one-unit increase in log troponin, or a 10-fold increase in troponin.

e

Time ratio represents changes in length of stay due to a one-unit increase in log BNP, or a 10-fold increase in BNP.