Translations:Advanced Field Epi:Manual 1 - Disease Investigation/297/en
| style="background-color:#ffffff;border:0.5pt solid #00000a;padding-top:0cm;padding-bottom:0cm;padding-left:0.199cm;padding-right:0.191cm;"| * Relatively quick
- Good for helping establish causation
- Usually strong internal validity
- Relatively small sample size and usually short duration
- Can't estimate incidence/prevalence