Table 3. Threshold effect analysis of attack time and platelet count in Chinese adults with Stanford type A acute aortic dissection after adjustment for age, sex, and smoking history.

Exposure: attack time (day)	Platelet count (109/L)a
Model I
One line slope	10.9 (8.0, 13.8) <0.001
Model II
Turning point (K)	3
< K slope 1	−8.8 (−20.2, 2.7) 0.136
> K slope 2	16.2 (12.1, 20.2) <0.001
Slope 2-Slope 1	24.9 (10.8, 39.0) 0.001
Predicted at K	144.0 (125.6, 162.5)
LRT test	0.001
95% CI of K	1.4875, 11

^aAdjusted for age, sex and history of smoking. Results in table: β (95% CI) p value. LRT test: likelihood-ratio test; CI: confidence interval