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Multi-trajectory analysis of C-reactive protein and low back pain from adolescence to early adulthood

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Abstract

Purpose

To identify low back pain (LBP) trajectories from early adolescence through to early adulthood and to investigate whether sustained levels of elevated subclinical C-reactive protein (CRP) are linked with these LBP trajectories.

Methods

We analysed longitudinal data from 1513 participants who were enrolled in the Raine Study cohort. Data on LBP with impact on daily living and CRP were collected at the ages of 14, 17, 20, and 22. We constructed group-based trajectory models to identify discrete trajectories of LBP with impact. We then evaluated how the CRP trajectories and the LBP with impact trajectories evolved jointly over time using a multi-trajectory analysis.

Results

The model identified three LBP trajectories. One subgroup included almost half the participants (46.1%) who had a consistently low probability of LBP. Another subgroup comprising 43.5% of participants had an increasing probability of LBP, while one in ten participants (10.4%) had a decreasing probability of LBP. There were no associations between elevated CRP and LBP trajectory subgroup membership.

Conclusion

Although young people follow distinct trajectories of LBP, CRP trajectories do not appear to be a distinguishing factor of the LBP trajectories. Previously reported associations between CRP and LBP may be explained by comorbidity or other factors. Future studies undertaking trajectory analysis should consider comorbidity clusters.

Level of Evidence I

Diagnostic: individual cross-sectional studies with the consistently applied reference standard and blinding

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Availability of data and materials

The data sets generated during and/or analysed during the current study are available from the corresponding author on reasonable request and with permission of the Raine Study.

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Acknowledgements

We would like to acknowledge the Raine Study participants and their families for their ongoing participation in the study and the Raine Study team for study co-ordination and data collection. In relation to the biological essay data used in this study, we acknowledge the in-kind support provided by the following institutions for biosample storage and curation: The University of Western Australia, School of Women’s and Infants’ Health, King Edward Memorial Hospital; The University of Western Australia, Medical School, Royal Perth Hospital; and Telethon Kids Institute. We would like to acknowledge Professor Charlotte Leboeuf-Yde for her assistance in design and supervision. We would also like to acknowledge Professor Anne Smith for her assistance with the revision of the manuscript.

Funding

The core management of the Raine Study is funded by The University of Western Australia, Curtin University, Telethon Kids Institute, Women and Infants Research Foundation, Edith Cowan University, Murdoch University, The University of Notre Dame Australia, and the Raine Medical Research Foundation. The Raine Study Gen2 14-, 17-, 20- and 22-year follow-ups were funded by NHMRC Project Grants (211912, 003209, 403981, 323200, 353514, 1021105, 1027449, 1044840, and 1021858), Safe Work Australia, and the WA Department of Health (G06302). AB is supported by a scholarship from Murdoch University, Western Australia, and a scholarship provided by Chiropractic Australia Research Foundation. JH receives salary support from the Canadian Chiropractic Research Foundation and the New Brunswick Health Research Foundation. The funding sources had no involvement in study design, analysis, interpretation, or manuscript preparation. For the remaining authors, none was declared.

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Authors

Contributions

All authors contributed to the study conception and design. Statistical analysis was performed by AB, JH, and AJ. All authors were involved with the interpretation of the results and drafting the manuscript. All authors reviewed and approved the final manuscript.

Corresponding author

Correspondence to Amber M Beynon.

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The authors declare that they have no conflict of interest.

Ethical approval

The Raine Study received ethical approval from the Human Ethics Committees at King Edward Memorial Hospital, Princess Margaret Hospital, University of Western Australia, and/or Curtin University. Ethics approval for the current study was granted by the Murdoch University Human Research Ethics Committee (Approval Number: 2018/226).

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Informed consent to participate in the study was to be obtained from participants (or their parent or legal guardian).

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Beynon, A.M., Hebert, J.J., Beales, D.J. et al. Multi-trajectory analysis of C-reactive protein and low back pain from adolescence to early adulthood. Eur Spine J 30, 1028–1034 (2021). https://doi.org/10.1007/s00586-020-06677-0

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