Table 3.

Multivariate Cox regression analysis between covariates and the incidence of POCD.

Covariates	HR	95%CI	P value
Age	1.058	1.012–1.107	0.014
Garden classification
I	–	–	–
II	0.913	0.380–2.194	0.839
III	0.838	0.242–2.907	0.781
IV	1.185	0.423–3.323	0.747
Surgery type
Dynamic hip screw	–	–	–
Proximal femoral nail	2.032	0.644–6.411	0.226
Hemi-arthroplasty	4.974	1.402–17.655	0.013
Total hip replacement	7.656	2.620–22.371	<0.001
Mini-Cog score (≥3 to ≤2)	0.601	0.339–1.064	0.081
Use of cFNB	0.556	0.316–0.981	0.043

POCD – postoperative cognitive dysfunction; HR – hazard ratio; CI – confidence interval; cFNB – continuous femoral nerve block.