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Table 1 Demographic characteristics of the included studies

From: Perioperative outcomes in different anesthesia techniques for patients undergoing hip fracture surgery: a systematic review and meta-analysis

Study (1st author year)

Country

Study type

Sample Size and Groups

RA

The diagnostic criteria for complications

Single or continuous, type

Drug type, concentration and dose

Basques [7] 2015

USA

Retrospective observational studies

9842

GA 7253

RA 2589

SA

Not mentioned

By ACS-NSQIP database

Benjamin [8] 2021

France

Retrospective observational studies

129

GA 43

RA 86

MNB 43

CSA 43

MNB: ropivacaine, 0.33%,

0.2–0.25 ml/kg

CSA: bupivacaine 0.5%, 1.5 ml

MI: be confirmed by the cardiologist in charge. Hypoxemia: defined by the need for oxygen

Brox [9] 2016

USA

Retrospective observational studies

7316

GA 4257

RA 3059

Single SA

CEA/CSEA

NB

Not mentioned

/

Chu [10] 2015

China

Retrospective observational studies

104,088

GA 52044

RA 52044

NA

Not mentioned

Using ICD-9-CM diagnosis

Elisabetta [11] 2014

USA

Retrospective observational studies

68,493

GA 61554

RA 6939

SA/EA

Not mentioned

/

Fields [12] 2015

USA

Retrospective observational studies

6628

GA 4813

RA 1815

SA

Not mentioned

According to ACS- NSQIP

Heidari [13] 2011

Iran

Randomized controlled studies

387

GA 197

RA 190

Single SA

CEA

SA: Bupivacaine 0.5%, 3 ml

CEA: Bupivacaine 0.5%, 25 ml

Be diagnosed by the consultant specialist

Helwani [14] 2015

USA

Retrospective observational studies

10,498

GA 5396

RA 5102

SA

Not mentioned

According to ACS- NSQIP

Li [4] 2022

China

Randomized controlled studies

942

GA 471

RA 471

Single SA

EA

CSA/CEA

Single or continuousNB

Be at the discretion of the consultant anesthesiologist

According to ACS-NSQIP guidelines,

Delirium: be based on Delirium Rating Scale-Revised-98

Linda [15] 2012

USA

Retrospective observational studies

308

GA 235

RA 73

Single SA

CSA/CEA

CSEA

NB

Not mentioned

By reviewing the discharge summaries from the hospital’s electronic records

Neuman [16]

2012

USA

Retrospective observational studies

18,158

GA 12,904

RA 5,254

Not mentioned

Not mentioned

Using ICD-9-CM diagnosis

Neuman [17] 2014

USA

Retrospective observational studies

56,729

GA 40825

RA 15904

SA/EA

Not mentioned

/

Neuman [5] 2021

USA

Randomized controlled studies

1262

GA 629

RA 633

Single SA

Be determined by the clinical team

Delirium: on the basis of 3D-CAM

Parker [18] 2015

UK

Randomized controlled studies

322

GA 164

RA 158

SA

Be the choice of the anesthetist

Not mentioned

Radcliff [19] 2008

USA

Retrospective observational studies

5683

GA 3353

RA 2330

CEA

SA

Not mentioned

Ascertained by the Veterans Health Administration National Surgical Quality Improvement Program data and ICD-9

Seitz [20] 2014

Canada

Retrospective observational studies

12,272

GA 6115

RA 6157

SA

Not mentioned

Not mentioned

Shih [21] 2010

China

Retrospective observational studies

335

GA 167

RA 168

Single SA

Bupivacaine 8-15 mg

Not mentioned

Tung [22] 2016

China

Retrospective observational studies

17,189

GA 11153

RA 6036

SA/EA

Not mentioned

Not mentioned

White [23] 2014

UK

Retrospective observational studies

39,331

GA 15666

RA 23665

SA

CSEA

SA + NB

Not mentioned

/

White [24] 2016

UK

Retrospective observational studies

2491

GA 985

RA 1506

SA

SA + NB

Not mentioned

Deterioration in cognition: abbreviated mental test score

Wood [25] 2011

UK

Retrospective observational studies

1067

GA 489

RA 578

SA

Bupivacaine 0.5%

1.5 ml

/

  1. GA General anesthesia, RA Regional anesthesia, NA Neuraxial anesthesia, Single SA Single-injection spinal anesthesia, SA Spinal anesthesia, EA Epidural anesthesia, CSA Continuous spinal anesthesia, CEA Continuous epidural anesthesia, CSEA Combined spinal epidural anesthesia, NB Nerve blocks, MNB Multiple nerve blocks, MI Myocardial infarction, ICD-9 International classification of diseases ninth revision, ICD-9-CM International classification of diseases-9-clinical modification, ACS-NSQIP The American college of surgeons national surgical quality improvement program, 3D-CAM 3-min diagnostic interview for confusion assessment method, / the study did not included complications