Table 4

Threshold effect analysis of two non-linearity variables

ExposureAnion gapLactate
Turning point (K)14.731.5
<K slope 11.01 (0.88, 1.17) 0.84750.41 (0.16, 1.05) 0.0619
>K slope 21.40 (1.24, 1.57) <0.00012.09 (1.67, 2.61) <0.0001
Slope 2–slope 11.38 (1.10, 1.72) 0.00535.08 (1.80, 14.30) 0.0021
Predicted at K−2.11 (−2.45, –1.78)−2.35 (−2.65, –2.04)
LRT0.0060.003
95% CI of TP (K)10.33 to 18.121250.86 to 3.33
  • Two-piece-wise regression was used to examine the threshold effect of the risk factor on the outcome.

  • LRT, likelihood ratio test; TP, turning point.