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A comparison of cluster and systematic sampling methods for measuring crude mortality.
Angela M C Rose1, Rebecca F Grais, Denis Coulombier
1Epicentre, Paris, France. angela.rose@epicentre.msf.org
Bulletin of the World Health Organization
|April 22, 2006
Summary
Comparing cluster and systematic surveys for retrospective mortality measurement, this study found similar crude mortality rates but differing under-5 mortality rates. Systematic surveys offered wider population estimates and narrower confidence intervals.
Area of Science:
- Epidemiology
- Public Health
- Demography
Background:
- Accurate retrospective mortality measurement is crucial for public health interventions.
- Survey sampling techniques significantly impact the reliability of mortality data.
- Understanding population dynamics requires robust data collection methods.
Purpose of the Study:
- To compare the effectiveness of cluster and systematic sampling techniques for retrospective mortality assessment.
- To evaluate the precision and accuracy of two distinct survey methodologies in a real-world setting.
- To determine the suitability of these methods for rapid public health assessments.
Main Methods:
- A cluster survey was followed immediately by a systematic survey on the same population in North Darfur, Sudan (2005).
- Both surveys aimed to measure retrospective mortality, including crude mortality rate and under-5 mortality rate (U5MR).
- Data collection was facilitated by the town's geographical layout and prior population estimates.
Main Results:
- Crude mortality rates were similar between cluster (0.80) and systematic (0.77) surveys.
- Under-5 mortality rates showed a difference (1.16 vs. 0.71), though not statistically significant.
- Cluster surveys exhibited wider 95% confidence intervals, particularly for U5MR, indicating lower precision.
Conclusions:
- Both methods yielded comparable age and sex distributions.
- Systematic surveys provided population size estimates and suggested potential for smaller sample sizes.
- Further research is recommended for mortality measurement in high-mortality settings.