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Table 2 Univariable Cox regression analysis for the risk factors associated with 30-day, 6-month and 1-year mortality

From: Systemic immune-inflammation index independently predicts poor survival of older adults with hip fracture: a prospective cohort study

Variables

30-day mortality

1-year mortality

Total mortality

HR (95% CI)

p value

HR (95% CI)

p value

HR (95% CI)

p value

Age (per 1 year increase)

1.12 (1.04–1.21)

0.002

1.07 (1.02–1.12)

0.008

1.08 (1.04–1.12)

<  0.001

Sex (male vs. female)

4.40 (1.43–16.24)

0.009

3.81 (1.74–8.94)

0.001

2.11 (1.24–3.62)

0.007

CCI = 0

1.00 (Reference)

–

1.00 (Reference)

–

1.00 (Reference)

–

CCI = 1

1.79 (0.33–9.69)

0.478

1.82 (0.62–5.32)

0.266

1.35 (0.67–2.65)

0.396

CCI ≥ 2

9.66 (2.68–44.83)

0.001

7.53 (3.03–20.24)

<  0.001

5.03 (2.69–9.42)

<  0.001

Fracture type (intertrochanteric vs. neck)

1.97 (0.66–6.52)

0.226

1.23 (0.57–2.68)

0.595

1.62 (0.94–2.80)

0.083

Surgery type (fixation vs. arthroplasty)

1.81 (0.59–6.70)

0.306

1.10 (0.51–2.45)

0.816

1.15 (0.67–1.99)

0.604

Time to surgery (per 1 day increase)

1.10 (0.83–1.30)

0.411

1.10 (1.01–1.17)

0.023

1.14 (1.08–1.19)

<  0.001

Albumin (<  3.5 g/dL vs. ≥ 3.5 g/dL)

4.77 (1.59–15.79)

0.006

4.27 (1.97–9.53)

<  0.001

2.52 (1.46–4.32)

0.001

SII (per 100 units)

1.16 (1.05–1.28)

0.003

1.11 (1.04–1.19)

0.004

1.12 (1.07–1.18)

<  0.001

  1. Abbreviation: HR Hazard ratio, CI Confidence interval, CCI Charlson comorbidity index, SII Systemic immune-inflammation index