Cited by 26Suicide and Self-Harm StudiesInflammatory Biomarkers in Disease PrognosisTryptophan and brain disorders

Elevated levels of monocyte-lymphocyte ratio and platelet-lymphocyte ratio in adolescents with non-suicidal self-injury

Open access
Zheng, Qi, Liu, Jin, Ji, YaJuan, Zhang, Yan, Chen, XinChao, Liu, BangShan·2022·BMC Psychiatry

Abstract

Background: Neutrophil–lymphocyte ratio (NLR), monocyte-lymphocyte ratio (MLR), and platelet-lymphocyte ratio (PLR) are blood indicators of systemic inflammation. This study aims to compare the levels of inflammatory indicators derived from blood routine tests between adolescents with non-suicidal self-injury (NSSI) and those with non-NSSI. Methods: A total of 201 adolescents with mood or emotional disorders were enrolled in this study, among which 106 had engaged in NSSI and 95 had never engaged in NSSI. NLR, MLR, and PLR were calculated based on the complete blood cell count. Results: There was no significant difference in demographic data between the two groups. The NSSI group exhibited significantly higher MLR (P = 0.001) and PLR (P = 0.007) than the non-NSSI group. Multivariate logistic regression analysis revealed that MLR (OR 1.545, 95%CI [1.087–2.281], P = 0.021) and PLR (OR 1.327, 95%CI [1.215–1.450], P < 0.001) were independently associated with NSSI. Receiver operating characteristic (ROC) curve analyses demonstrated that for differentiating NSSI from non-NSSI, the optimal cut-off value of MLR was 0.135 and the area under curve was 0.638 ([0.561- 0.715], P < 0.001), with a sensitivity of 90.60% and a specificity of 33.70%; the optimal cut-off value of PLR was 127.505 and the area under curve was of 0.611 ([0.533–0.689], P < 0.001), with a sensitivity of 39.60% and a specificity of 81.10%. Conclusions: Systemic inflammation, as indicated by elevated MLR and PLR, was found to be strongly associated with NSSI among adolescents.

AI snapshot

Written from the paper’s full text.

TL;DR

Among 201 adolescents with mood or emotional disorders, those with non-suicidal self-injury (NSSI) had significantly higher monocyte-lymphocyte ratio (MLR) and platelet-lymphocyte ratio (PLR) than those without NSSI. MLR and PLR were independently associated with NSSI, though their ROC discrimination was modest.

Key findings

  • The NSSI group had significantly higher MLR (median 0.19 vs 0.16, p = 0.001) and PLR (median 115.66 vs 107.85, p = 0.007), as well as higher monocyte count (0.46 vs 0.42 ×10³/µL, p = 0.011) and lower lymphocyte count (2.39 vs 2.56 ×10³/µL, p = 0.043). NLR did not differ significantly (p = 0.091), nor did WBC, neutrophil count, platelet count, or MPV (all p > 0.05).
  • In multivariate logistic regression, MLR (OR 1.545, 95% CI 1.087–2.281, p = 0.021) and PLR (OR 1.327, 95% CI 1.215–1.450, p < 0.001) were independently associated with NSSI.
  • ROC analysis for differentiating NSSI from non-NSSI: MLR AUC 0.638 (95% CI 0.561–0.715), cut-off 0.135, sensitivity 90.60%, specificity 33.70%; PLR AUC 0.611 (95% CI 0.533–0.689), cut-off 127.505, sensitivity 39.60%, specificity 81.10%.

Methods

  • A total of 201 inpatient adolescents aged 13–18 years with mood or emotional disorders were enrolled: 106 with NSSI and 95 without NSSI. NSSI was determined by DSM-5 criteria and history of ≥1 self-injury in the past month; exclusions included current other psychiatric disorder, suicide attempt or ideation, serious physical illness/inflammatory conditions, and recent anti-inflammatory, corticosteroid, or antipyretic use.
  • Fasting cubital vein blood samples were used for complete blood cell count; NLR, MLR, and PLR were calculated. Groups were compared using independent t tests or Mann–Whitney U tests, followed by multivariate logistic regression and ROC curve analysis (SPSS v26; two-tailed p < 0.05).

Limitations

  • The paper states that it could not control for smoking, alcohol consumption, substance use, menstrual cycle, or BMI; did not evaluate NSSI symptom severity or other immune indicators such as CRP and interleukins; used convenience sampling from one hospital, risking selection bias; and was cross-sectional with a small sample, precluding causal inference.
  • The paper also notes that MLR and PLR vary by age and sex in the Chinese population, and because the sample was mostly female and all participants were ≤18 years, the ROC cut-off values may not be suitable for males or other age groups.
  • Evident from the text: the ROC AUCs for MLR (0.638) and PLR (0.611) indicate only modest discrimination, which the paper itself acknowledges.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1186/s12888-022-04260-z

Cites

61 of 61 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 11 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    For differentiating NSSI from non-NSSI, the optimal PLR cut-off was 127.505, with a sensitivity of 39.60% and a specificity of 81.10%.

    “the optimal cut-off value of PLR was 127.505 and the area under curve was of 0.611 ([0.533–0.689], P < 0.001), with a sensitivity of 39.60% and a specificity of 81.10%”
    • Also stated in: § Results · plain
      “The optimal cut-off value was 127.505 for PLR, with a sensitivity of 39.60% and specificity of 81.10%”
    Quote in the paperSubstantial claim
  • Findingown data

    MLR was significantly higher in adolescents with NSSI than in those without NSSI.

    “The NSSI group exhibited significantly higher MLR (P = 0.001) and PLR (P = 0.007) than the non-NSSI group.”
    • Also stated in: § Results · plain
      “The monocyte count, MLR, and PLR were significantly higher in adolescents with NSSI than those without NSSI (p = 0.011, p = 0.001, p = 0.007, respectively).”
    Quote in the paperSubstantial claim
  • Findingown data

    PLR was significantly higher in adolescents with NSSI than in those without NSSI.

    “The NSSI group exhibited significantly higher MLR (P = 0.001) and PLR (P = 0.007) than the non-NSSI group.”
    • Also stated in: § Results · plain
      “The monocyte count, MLR, and PLR were significantly higher in adolescents with NSSI than those without NSSI (p = 0.011, p = 0.001, p = 0.007, respectively).”
    Quote in the paperSubstantial claim
  • Findingown data

    PLR was independently associated with NSSI in multivariate logistic regression (OR 1.327, 95% CI 1.215-1.450, p < 0.001).

    “Multivariate logistic regression analysis revealed that MLR (OR 1.545, 95%CI [1.087–2.281], P = 0.021) and PLR (OR 1.327, 95%CI [1.215–1.450], P < 0.001) were independently associated with NSSI.”
    • Also stated in: § Results · plain
      “Multivariate logistic regression analysis showed that MLR (OR 1.545, 95% CI [1.087–2.281], p = 0.021) and PLR (OR 1.327, 95%CI [1.215–1.450], p < 0.001) were independently associated with NSSI (Table 3).”
    Quote in the paperSubstantial claim
  • Findingown data

    For differentiating NSSI from non-NSSI, PLR had an area under the curve of 0.611 (95% CI 0.533-0.689, p < 0.001).

    “the optimal cut-off value of PLR was 127.505 and the area under curve was of 0.611 ([0.533–0.689], P < 0.001)”
    • Also stated in: § Results · plain
      “the area under curve was 0.638 ([0.561- 0.715], p < 0.001) for MLR and 0.611 ([0.533–0.689], p < 0.001) for PLR”
    Quote in the paperSubstantial claim
  • May combine two claims. 5
  • Classified as probably not a substantial claim. 5
  • May combine two claims.

    Findingown data

    For differentiating NSSI from non-NSSI, the optimal MLR cut-off was 0.135, with a sensitivity of 90.60% and a specificity of 33.70%.

    “the optimal cut-off value of MLR was 0.135 and the area under curve was 0.638 ([0.561- 0.715], P < 0.001), with a sensitivity of 90.60% and a specificity of 33.70%”
    • Also stated in: § Results · plain
      “The optimal cut-off value was 0.135 for MLR, with a sensitivity of 90.60% and specificity of 33.70%”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    In the Chinese population, MLR and PLR values vary with age and gender, with males exhibiting higher PLR and lower MLR than females, and with age increases, PLR decreases and MLR increases.

    “a previous study showed that the MLR and PLR values vary with age and gender in the Chinese population, with males exhibiting higher PLR and lower MLR than females, and with age increases, PLR decreases and MLR increases [58].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [58] Wang J, Zhang F, Jiang F, Hu L, Chen J, Wang Y. Distribution and reference interval establishment of neutral-to-lymphocyte ratio (NLR), lymphocyte-to-monocyte ratio (LMR), and platelet-to-lymphocyte ratio (PLR) in Chinese healthy adults. J Clin Lab Anal. 2021;35(9): e23935.

      Not checked in the free run.

  • May combine two claims.

    Study design and conductown data

    There were no significant differences in age, gender, family history, and diagnoses between the NSSI and non-NSSI groups.

    “There was no significant difference in demographic data between the two groups.”
    • Also stated in: § Results · plain
      “There were no significant differences in age (p = 0.094), gender (p = 0.359), family history (p = 0.125), and diagnoses (p = 0.260) between the two groups.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Study design and conductreasoning

    The study is cross-sectional with a small sample size, which precluded identifying any causal relationship between the inflammatory indicators and NSSI.

    “Finally, the present study is a cross-sectional study with a small sample size, which precluded us from identifying any causal relationship between the inflammatory indicators and NSSI.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    NLR, MLR, and PLR are relatively stable biomarkers of systemic inflammation.

    “According to previous studies, Neutrophil–Lymphocyte Ratio (NLR), Monocyte-Lymphocyte Ratio (MLR), and Platelet-Lymphocyte Ratio (PLR) are relatively stable biomarkers of systemic inflammation [13, 14].”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [13] Mazza MG, Lucchi S, Rossetti A, Clerici M. Neutrophil-lymphocyte ratio, monocyte-lymphocyte ratio and platelet-lymphocyte ratio in non-affective psychosis: a meta-analysis and systematic review. World J Biol Psychiatry. 2020;21(5):326–38. source

      Not checked in the free run.

    • cites [14] Mazza MG, Lucchi S, Tringali AGM, Rossetti A, Botti ER, Clerici M. Neutrophil/lymphocyte ratio and platelet/lymphocyte ratio in mood disorders: a meta-analysis. Prog Neuropsychopharmacol Biol Psychiatry. 2018;84(Pt A):229–36. source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductreasoning

    Participants were recruited by convenience sampling from one hospital, which may bring about selection bias and decrease the representativeness of the sample.

    “Fourth, the participants were recruited by convenience sampling from one hospital, which may bring about selection bias and decrease the representativeness of the sample.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The possible association between the severity of NSSI symptoms and inflammatory indicators was not evaluated.

    “Second, the possible association between the severity of NSSI symptoms and inflammatory indicators was not evaluated.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    Other indicators of immune functions, such as CRP and interleukins, were not evaluated.

    “Third, other indicators of immune functions, such as CRP and interleukins, were not evaluated.”
    Quote in the paperNot a substantial claim
8 of 8
  • The paper relies on this without support.

    No prior studies have directly investigated the correlation between blood cell counts and NSSI.

    “To our knowledge, no studies have directly investigated the correlation between blood cell counts and NSSI.”
  • The paper relies on this without support.

    Testing NLR, MLR, and PLR is cost-effective and easy to access.

    “The testing of these markers is cost-effective and easy to access, indicating its potential value for clinical application.”
  • The paper relies on this without support.

    This is the first study to probe NLR, MLR, and PLR as hallmarks of systemic inflammation in adolescents with NSSI.

    “To the best of our knowledge, this is the first study probing NLR, MLR, and PLR as hallmarks of systemic inflammation in adolescents with NSSI.”
3 of 3

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Inclusion criterion conflicts with the non-NSSI group

    Minor

    The inclusion criteria require participants to have engaged in NSSI, but the study also enrolled 95 adolescents who had never engaged in NSSI. As written, those participants could not meet the stated criteria.

1 of 1

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. Association AP: Other Conditions That May Be a Focus of Clinical Attention. In: Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition Volume 2, edn. U.S.; 2013:803-6.

Cited by

Sorted by citations

Authors
Zheng, Q., Liu, J., Ji, Y., Zhang, Y., Chen, X., & Liu, B.
Affiliations
Second Xiangya Hospital of Central South University (CN)
Corresponding author
  • Chen, XinChao
  • Liu, BangShan
Venue
BMC Psychiatry
Published
2022-09-19
Volume
22
Issue
1
Pages
618-618
ISSN
1471-244X (ISSN-L)
OpenAlex
W4296456197
Cited by
26
References
61
Citations by year
2026: 3 · 2025: 10 · 2024: 8 · 2023: 5
FWCI
5.24
Type
journal article
Language
en
Open access
Locations
  • BMC Psychiatry (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
the Science and Technology Program Guidance Project of Xiamen City (No. 3502Z20214ZD1281)
Topics
  • Social Sciences › Psychology › Clinical Psychology › Suicide and Self-Harm Studies
  • Health Sciences › Medicine › Oncology › Inflammatory Biomarkers in Disease Prognosis
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
Keywords
non-suicidal self-injury, monocyte-to-lymphocyte ratio, platelet-to-lymphocyte ratio, neutrophil-to-lymphocyte ratio, systemic inflammation, adolescents, mood disorders, inflammatory markers, diagnostic thresholds
MeSH terms
Adolescent, Humans, Inflammation, Lymphocytes, Monocytes, Prognosis, Retrospective Studies, Self-Injurious Behavior

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