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Assessing the coding reliability of work accidents statistical data: How coders make a difference
Celeste Jacinto1, Fernando P Santos2, Carlos Guedes Soares2
1UNIDEMI, Department of Mechanical and Industrial Engineering, Faculty of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
Coding accident statistics reliably is crucial. Expert coders achieve high reliability, but non-experts show a significant decrease in accuracy when using the European Statistics of Accidents at Work (ESAW) system.
Area of Science:
- Occupational health and safety
- Statistical data quality assessment
- Workplace accident analysis
Background:
- The European Statistics of Accidents at Work (ESAW) system is vital for workplace safety research and policy.
- Portugal's governmental Cabinet for Strategy and Planning (GEP) currently handles ESAW coding.
- Transitioning to electronic forms (e-forms) may involve non-expert coders, potentially impacting data reliability.
Purpose of the Study:
- To quantify the reliability of accident data coding performed by expert coders (GEP).
- To assess the impact on reliability when non-experts code ESAW data.
- To identify specific variables or codes that may require improvement for better consistency.
Main Methods:
- Estimation of intercoder and intracoder reliability for 8 nominal variables.
- Utilized 3 reliability coefficients calculated across 3 distinct software packages.
- Compared reliability metrics between an expert group (GEP) and two groups of non-expert coders.
Main Results:
- Expert coders (GEP) demonstrated good to excellent reliability (68-98%) for ESAW variables.
- A significant reliability loss (-5% to -39%) was observed when non-experts performed the coding.
- Certain variables consistently showed higher reliability regardless of coder expertise.
Conclusions:
- The coder's profile substantially influences the reliability of accident data coding.
- Transitioning coding tasks to non-experts necessitates careful consideration due to potential reliability decline.
- Further investigation into improving specific ESAW codes and cross-EU reliability assessments is recommended.
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