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Validation of self-reported cellular phone use.
Florence Samkange-Zeeb1, Gabriele Berg, Maria Blettner
1School of Public Health, University of Bielefeld, Germany. zodwa@freenet.de
Summary
This study found that people recall the number of cellular phone calls made more accurately than total usage time. This suggests using call frequency for future cancer risk research.
Area of Science:
- Epidemiology
- Public Health
- Mobile Technology
Background:
- Growing concerns about potential adverse health effects of cellular phone use.
- Challenges in accurately assessing cellular phone use in epidemiological studies.
- Limited existing research on the validity of self-reported cellular phone data.
Purpose of the Study:
- To validate the self-reported cellular phone use questionnaire used in the international Interphone study.
- To compare self-reported data with objective network provider records.
- To improve the reliability of data in mobile phone health research.
Main Methods:
- Compared self-reported cellular phone use with network provider data for 68 participants over 3 months.
- Utilized Spearman's rank correlation and Kappa coefficients for validation.
- Network provider data served as the gold standard for comparison.
Main Results:
- Good correlation found between self-reported and network provider data for the number of calls per day (r=0.62).
- Moderate correlation observed for the average call duration (r=0.34).
- Cumulative cellular phone use showed a correlation of r=0.56.
Conclusions:
- Self-reported number of cellular phone calls is a more reliable metric than cumulative usage time.
- Call frequency should be prioritized for dose-response analysis in epidemiological studies.
- Findings enhance the validity of data in research on cellular phone health impacts.