Threshold effect analysis of Hcy level on LOS
| Items | β (95% CI) | P |
| Linear regression model | 0.16 (0.06 to 0.27) | 0.003 |
| Non-linear model, regression coefficients (β) | ||
| Break point of Hcy (K) | 22.63 | |
| <K | 0.36 (0.18 to 0.55) | <0.001 |
| ≥K | −0.09 (−0.30 to 0.13) | 0.436 |
| Difference of β value between strata | −0.45 (−0.80 to −0.10) | 0.012 |
| Predicted value of LOS at break point | 12.51 (10.77 to 14.26) | |
| P value for likelihood ratio test | 0.008 | |
Adjusted for gender, age, number of historical hospitalisations, surgical history, vascular disease history, drinking history, smoking history, insurance type, surgical approach, diseased limb, rest pain, Fontaine classification, ACCI, Urea, CRP, TP, LDL-C, HDL-C, FIB, APTT, TT and PT-INR.
ACCI, age-adjusted Charlson comorbidity index; APTT, activated partial thromboplastin time; CRP, C reactive protein; FIB, fibrinogen; Hcy, homocysteine; HDL-C, high density lipoproteins cholesterol; LDL-C, low density lipoprotein cholesterol; LOS, length of stay; PT-INR, prothrombin time international normalised ratio; TP, total protein; TT, thrombin time; β, regression coefficients.