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Table 1 Studies characteristics and demographics

From: The importance of inflammatory biomarkers in non-specific acute and chronic low back pain: a systematic review

First author

Year of publication

Design of included studies

Study population

Total no. of patients

Mean age (SD)

Male/Female (%)

LBP assessment

Duration of LBP

Biomarkers in study

Katja Gebhardt et al. [40]

2006

Prospective longitudinal study

CLBP group compared to ALBP group

41 with CLBP and 31 with ALBP

CLBP: 42.2 (range 27–57), ALBP: 44.8 (range 20–64) SD-NR

CLBP: 34.1/65.9 ALBP: 48.4/51.6

VAS, Functional back capacity was evaluated through Funktionsfragebogen Hannover Rucken

ALBP: < 3 months; CLBP: > 3 months

Hs-CRP

Heffner et al. [29]

2011

Cross-sectional

CLBP group compared to control group

25 with CLBP and 25 age- and sex-matched controls

30.8 (11.4)

40/60

McGill Pain Questionnaire—Short Form (MPQ-SF)

 > 6 months

IL-6

Matthew S. Briggs et al. [30]

2013

Cross-sectional

Patients with LBP

5481

NR

37.1/42.7

NHANES questionnaires, Miscellaneous Pain Questionnaire and Physical Functioning Questionnaire

NR

CRP, fibrinogen

Queiroz et al. [32]

2016

Cross-sectional

Female patients > 65 years

71 CLBP and 71 controls

CLBP group: 71.4 (5.1) Control group: 71.5 (4.9)

0/100

VAS, Roland–Morris Disability Questionnaire (RMDQ)

 ≥ 6 weeks

IL-6, TNF-α

Yong Li et al. [19]

2016

Cross-sectional

CLBP group compared to control group

35 with CLBP and 35 controls

Aged 45–70 (NR)

NR

NR

 > 1 year

IL-6, IL-10, CD14, CD16, β-endorphin

David M. Klyne et al. [34]

2016

Cross-sectional

ALBP group compared to control group

99 ALBP and 55 controls

29 (8)

ALBP group: 53/46

VAS, Roland–Morris Disability Questionnaire (RMDQ), Pain Self-Efficacy Questionnaire (PSEQ), Pain Catastrophizing Scale (PCS)

 < 2 weeks

CRP, TNF, IL-1β, IL-6

Luchting B. et al. [33]

2016

Cross-sectional

NSLBP group compared to neuropathic pain group and healthy control group

19 with CLBP; 19 with neuropathic pain and 19 controls

CLBP group: 40 (11) Neuropathic Pain group: 47 (13) Control group: 58 (13)

CLBP group: 58% Neuropathic Pain group: 79% Control group: 68%

PainDETECT-questionnaire

5.9 ± 4.2 years

P2X7R, IL-1β

Queiroz et al. [35]

2017

Cross-sectional

Female patients > 65 years

155

70.7 (5.3)

0/100

MPQ, NPS

 < 6 weeks

TNF-α, sTNFR1, IL-1, IL-6

David M. Klyne et al. [41]

2018

Prospective longitudinal study

ALBP group compared to control group

109 with ALBP and 55 controls

ALBP: 29 (8) Controls: 27 (6)

ALBP group: 53.2/46.8 Control group: 30.9/69.1

NRS, RMDQ

 < 2 weeks. Secondary follow-up of a subgroup with CLBP at 6 months

CRP, TNF, IL-1β, IL-6

Teodorczyk-Injeyan et al. [37]

2019

Cross-sectional

ALBP group compared to CLBP group and control group

22 with ALBP, 25 with CLBP and 24 controls

ALBP: 32.8 (9.2) CLBP: 36.5 (11.1) Controls: 35.2 (10.4)

13/9 ALBP; 14/11 CLBP and 15/9 controls

VAS, ODI

ALBP: < 4 weeks CLBP: > 12 weeks

TNFα, IL1β, IL-6, IL-2, IL-10, IL-1 receptor antagonist, TNF2

Kevin Kwan Ngai Ho et al. [36]

2019

Cross-sectional

Rural population with CLBP

6559

52.6

45.7

Standardized Nordic Questionnaire for Musculoskeletal Symptoms. CLBP definition is consistent with the criteria of HUNT3 studies

 > 3 months

CRP

Payman Dadkhah et al. [38]

2020

Cross-sectional

CLBP group compared to control group

148 with CLBP and 150 controls

CLBP: 49.2 (6.1) Controls: 47.57 (5.8)

CLBP: 48.8/50.3

McGill Pain Questionnaire, Oswestry Disability Index

 > 3 months

IL-1B, IL-6, HS-CRP, TNFα

Amber M Beynon et al. [42]

2021

Longitudinal cohort study

Multi-generation from Western Australia

1513

Evaluations at 14, 17, 20 and 22 years

NR

Questionnaire items of the Raine Study

LBP within the last month

Hs-CRP

Hao-Wei Xu et al. [39]

2021

Cross-sectional

ALBP group compared to CLBP group and control group

60 with ALBP, 78 with CLBP and 60 controls

LBP: 63.42 (11.26) Controls: 62.31 (11.06)

ALBP: 17/43 CLBP: 27/51 Controls: 28/32

VAS, MODQ

ALBP: < 3 months; CLBP: > 3 months

25(OH)D, CRP, neutrophils, WBCs, TNF-α, IL-6, IL-1

David M. Klyne et al. [43]

2022

Longitudinal cohort study

Patients with ALBP

84 with ALBP

30 ± 8

45/39

NRS, Roland–Morris Disability Questionnaire, Pain Catastrophizing Scale, Pain Self-Efficacy Questionnaire

 < 2 weeks

CRP, IL-6, IL-1b, TNF

  1. ALBP acute low back pain; CLBP chronic low back pain; HS-CRP high-sensitive C-reactive protein; CRP C-reactive protein; MODQ modified Oswestry Disability Questionnaire; WBC white blood cells; NRS numerical rating scale; VAS visual analogue scale