Free drill · Community domain
Populations, data, evidence.
The smallest slice of the blueprint and the one most people under-study — which is exactly why it moves your score. Epidemiology, biostatistics, the dental indices, levels of prevention, and how to read a study. Answer, and the reasoning lands immediately.
- ✓Epi and biostats made concrete. Incidence vs prevalence, sensitivity and specificity, data types, and central tendency — with real numbers to work.
- ✓Type the calculation. Several items make you compute the answer and enter it — sensitivity, incidence, mean DMFT — no options to reverse-engineer.
- ✓The indices, straight. DMFT, dmft, OHI-S, and the Gingival Index — what each one actually measures.
- ✓Feeds your dashboard. Your score rolls into your Community readiness — a domain nothing else here drills directly.
18 questions · streaks, mastery & a Flawless run to chase
Community health & research
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This run
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18 questions
Clean sweep
Every item first try — recall and the biostats math both. This domain is banked.
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Keep this · community & research at a glance
| Incidence | New cases over a time period (risk) |
| Prevalence | All existing cases at one point in time |
| Sensitivity | TP ÷ (TP + FN) — detects true positives |
| Specificity | TN ÷ (TN + FP) — clears true negatives |
| DMFT | Decayed/Missing/Filled permanent teeth (irreversible) |
| dmft / deft | Same idea for the primary dentition (lowercase) |
| OHI-S | Debris index + Calculus index on 6 surfaces |
| Gingival Index | Severity of gingival inflammation (0–3), incl. bleeding |
| Prevention | Primary (before disease) · Secondary (early) · Tertiary (limit damage) |
| Evidence top | Systematic review / meta-analysis of RCTs |
This drill is a study aid for community health and research principles on the NBDHE. The House of Hygiene is not affiliated with or endorsed by the JCNDE.