Table 4 Univariate logistic regression analysis of risk factors for delayed cognitive recovery on the 4th day

Age (age ≥ 70, age<70)

1.842(0.915–3.710)

0.087*

2.311(1.096–4.876)

0.028**

Smoking

0.831(0.424–1.630)

0.59

Medical history

 Diabetes mellitus

2.006(0.897–4.489)

0.09*

1.972(0.845–4.599)

0.116

 History of cerebrovascular disease

1.615(0.602–4.332)

0.341

 Previous major surgery history

2.337(0.881-6.200)

0.088*

2.126(0.764–5.918)

0.149

Surgical data

VICA(use sevoflurane ≥ 50 min)

1.409(0.512–3.878)

0.507

Hypotension(MAP ≤ 65mmHg)

1.147(0.545–2.416)

0.717

Perioperative inadvertent hypothermia(<35℃)

1.354(0.563–3.255)

0.498

Pre-NLR ≥ 2.5

0.462(0.211–1.012)

0.054*

0.428(0.188–0.975)

0.043**

NRS (resting) ≥ 4 at 1st day after surgery

0.731(0.277–1.932)

0.528