Table 2.
N-n ROC |
N-n Wald stat |
LR ROC | N-n Wald stat |
Both: ROC |
Both: Wald stat |
N-n add? |
LR add? |
|||
---|---|---|---|---|---|---|---|---|---|---|
HRC | 0.71 | 134 | 0.74 | 105 | 0.74 | 137 | * | * | ||
WBC | 0.57 | 12 | 0.53 | 3.1 | 0.58 | 15 | * | |||
I:T ratio | 0.67 | 58 | 0.69 | 60 | 0.70 | 74 | * | * | ||
platelet count | 0.61 | 33 | 0.62 | 55 | 0.63 | 58 | * | |||
glucose | 0.51 | 0.4 | 0.54 | 3.5 | 0.54 | 3.8 | ||||
pCO2 | 0.56 | 5.5 | 0.58 | 5.8 | 0.58 | 6.9 | * | |||
pH | 0.57 | 6.3 | 0.58 | 6.2 | 0.59 | 9.6 | * | |||
HCO3 | 0.53 | 0.9 | 0.58 | 9.0 | 0.60 | 15 | * | * | ||
Combined model | 0.85 | 317 | 0.87 | 311 | 0.87 | 472 | * | * | ||
Optimal model | 0.86 | 358 | 0.87 | 319 | 0.88 | 480 | * | * |
N-n = nearest-neighbor analysis; LR = logistic regression; both = bivariable regression model using results of nearest-neighbor analysis and multivariable logistic regression models; ROC = receiver-operating characteristic area; Wald stat = Wald statistic; HRC = heart rate characteristics; WBC = white blood cell count; I:T ratio = ratio of immature to total white blood cell forms; N-n add * = nearest-neighbor model added significant information to logistic regression model (p<0.05); LR add * = logistic regression model added significant information to nearest-neighbor model (p<0.05).