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Area of Science:

  • Psychology
  • Public Health
  • Epidemiology

Background:

  • Substantial rates of inconsistent reporting exist in substance use and suicidality research.
  • Most studies overlook the issue of inconsistent reporters, potentially biasing results.

Purpose of the Study:

  • To estimate the prevalence of inconsistent reporters on substance use and suicide attempts.
  • To assess how excluding inconsistent reporters impacts the association between substance use and suicide attempts.

Main Methods:

  • A representative sample of 5,592 secondary school students (mean age 15.9) completed measures on substance use and suicide attempt.
  • Prevalence estimates were calculated using raw data, domain-specific exclusion, and complete exclusion of inconsistent reporters.
  • Logistic regressions analyzed the link between substance use and suicide attempt with and without inconsistent reporters.

Main Results:

  • Approximately 26% of participants showed inconsistent substance use reporting, and 15% for suicide attempts, totaling 36% inconsistent reporters.
  • Excluding inconsistent reporters altered prevalence estimates, particularly for abstainers.
  • The association between inebriation experience/cannabis use and suicide attempts became non-significant after excluding inconsistent reporters.

Conclusions:

  • Inconsistent reporting is a critical factor in substance use and suicidality research that requires systematic consideration.
  • Researchers and policymakers should exercise caution when interpreting findings from studies that do not account for inconsistent reporting.