Table 3. Final model for prediction COT failure (LOT score).

β: regression coefficient per unit increase, COT: conventional oxygen therapy, LOT: Lactate, Oxygenation, and Temperature

Variable	βi	Category (j)	Reference value (Wij)	βi(Wij - Wi REF)	Points
Lactate, mmol/L	10.324
		< 1.0	0.5 = W1 REF	-	0
		1.0 - 1.4	1.2	0.7227	1
		1.5 - 1.9	1.7	12.389	2
		≥ 2.0	2.5	20.648	4
P/F ratio	-0.0189
		≥ 400	415 = W2 REF	-	0
		325 - 399	363	0.9828	2
		250 - 324	288	24.003	4
		175 - 249	213	38.178	7
		< 175	150	50.085	9
Body temperature, °C	0.8075
		< 37.0	36.5 = W3 REF	-	0
		37.0-37.4	37.2	B = 0.5653	1
		37.5-37.9	37.7	0.9690	2
		38.0-38.9	38.5	16.150	3
		≥ 39	39.5	24.225	4