Table 2 Univariate and multivariate Cox regression analysis of risk factors associated with one-year mortality

Age (per 1 year increase)

1.09 (1.05–1.12)

< 0.001

1.07 (1.04–1.11)

< 0.001

Gender (male vs. female)

1.75 (1.15–2.68)

0.009

1.68 (1.08–2.61)

0.020

CCI = 0

1.0 (Reference)

-

1.0 (Reference)

-

CCI = 1

1.87 (0.68–5.09)

0.223

1.89 (0.68–5.23)

0.222

CCI = 2

3.82 (1.54–9.49)

0.004

3.15 (1.25–7.91)

0.015

Fracture type (ITF vs. neck)

1.05 (0.68–1.63)

0.821

-

-

Surgery type (fixation vs. arthroplasty)

0.96 (0.58–1.58)

0.875

-

-

Delay to surgery (> 48 h vs. ≤ 48 h)

1.76 (1.10–2.82)

0.018

1.52 (0.94–2.44)

0.087

Blood transfusion (yes vs. no)

1.31 (0.82–2.09)

0.264

-

-

Anemia (yes vs. no)

1.58 (0.97–2.59)

0.067

-

-

Albumin (< 3.5 vs. ≥ 3.5)

2.19 (1.43–3.35)

< 0.001

1.71 (1.11–2.64)

0.016

SII0 (high group vs. low group), 10⁹/L

1.16 (0.76–1.76)

0.501

-

-

SII1 (high group vs. low group), 10⁹/L

1.27 (0.83–1.93)

0.274

-

-

SII5 (high group vs. low group), 10⁹/L

2.80 (1.82–4.33)

< 0.001

2.16 (1.38–3.38)

0.001