ICU	Intensive Care Unit
NAS	Nursing Activities Score
ANOVA	Analysis of Variance
SD	Standard Deviation
R2	Coefficient of Determination
COVID-19	Coronavirus Disease 2019
EU	European Union
N/P	Nurse-to-Patient Ratio
TISS-28	Therapeutic Intervention Scoring System–28
CM	Cabinet of Ministers (Republic of Latvia)
IBM-SPSS	International Business Machines Statistical Package for the Social Sciences
Q1-Q3	First to Third Quartile
IQR	Interquartile Range
Tukey HSD	Tukey Honestly Significant Difference Test
PĒK	Research Ethics Committee (Rīga Stradiņš University)
M	Mean
n	Sample Size
p	Probability Value
t	Student’s t-Test
CI	Confidence Interval
F	F-Statistic
η2	Eta Squared (Effect Size)
ω2	Omega Squared (Effect Size)
Wald z	Wald z-Statistic
ICC	Intraclass Correlation Coefficient
AIC	Akaike Information Criterion
χ2	Chi-Square Statistic
β	Standardized Regression Coefficient
ARIMA	Autoregressive Integrated Moving Average
RMSE	Root Mean Square Error
MAE	Mean Absolute Error
MAPE	Mean Absolute Percentage Error
MA	Moving Average
ACF	Autocorrelation Function
PACF	Partial Autocorrelation Function
SOFA	Sequential Organ Failure Assessment
APACHE	Acute Physiology and Chronic Health Evaluation