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| Utafiti wa Kiikolojia wa Kutazama Mbele× | Utafiti wa Cohort× | |
|---|---|---|
| Nyanja | Epidemiolojia | Epidemiolojia |
| Familia | Process / pipeline | Process / pipeline |
| Mwaka wa asili≠ | 1950s–1970s (ecological epidemiology); prospective variant widely applied from 1980s onward | Mid-20th century (formal epidemiological design codified ~1950s) |
| Mwanzilishi≠ | Ecological study design formalised in epidemiology mid-20th century; prospective variant established through environmental and chronic disease research | Doll & Hill (British Doctors Study, 1951); Snow (cholera, 1854) |
| Aina≠ | Observational epidemiological study design | Observational longitudinal study design |
| Chanzo asilia≠ | Morgenstern, H. (1998). Ecological studies. In K. J. Rothman & S. Greenland (Eds.), Modern Epidemiology (2nd ed., pp. 459–480). Lippincott-Raven. link ↗ | Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern Epidemiology (3rd ed.). Lippincott Williams & Wilkins. ISBN: 978-0781755641 |
| Majina mbadala | prospective ecologic study, prospective aggregate-level study, prospective group-level study, ecological cohort study | longitudinal study, follow-up study, panel study, incidence study |
| Zinazohusiana≠ | 4 | 6 |
| Muhtasari≠ | A prospective ecological study is an observational epidemiological design in which groups — not individuals — serve as the unit of analysis, and exposure data are collected going forward in time before outcomes are measured. Investigators define geographically, politically, or socially bounded populations, characterise their aggregate exposures at baseline, then ascertain group-level outcomes (disease rates, mortality rates) at one or more later time points. Because exposure precedes outcome measurement, this design provides stronger temporal evidence than retrospective ecological studies. | A cohort study assembles a group of individuals who share a common starting point — typically freedom from the outcome of interest — and follows them over time to observe who develops the outcome. By comparing incidence rates between exposed and unexposed subgroups, researchers can estimate relative risk and absolute risk differences. Cohort studies are the gold-standard observational design for measuring disease incidence and establishing temporal relationships between exposure and outcome. |
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