Public Health Practitioner (China) cheat sheet
Public Health Practitioner (China) · Keep the key ideas within reach.
Disease frequency, study design and causal interpretation
Label events, population and time before calculating frequency.
Distinguish risk, odds and person-time rates.
Consider selection, measurement, confounding and effect modification separately.
Causal attributable claims require more than an observed association.
Variation, inference and screening calculations
Match the method to sampling, pairing and assumptions.
Separate individual spread, estimator uncertainty and clinical thresholds.
Use the correct disease-status denominator for sensitivity and specificity.
Predictive value changes with prevalence even when test characteristics are fixed.
Environmental pathways, water and air
Trace source, pathway, exposure and susceptibility.
Distinguish primary emissions from secondary atmospheric chemistry.
Treat water safety as multiple complementary barriers.
Interpret samples with timing, detection and representativeness limits.
Workplace hazards and prevention priorities
Assess task-specific routine and nonroutine exposures.
Prioritize source and engineering controls over reliance on PPE alone.
Use characteristic findings as evidence, not infallible occupational diagnosis.
Surveillance supports prevention and never substitutes for controlling the hazard.
Nutrition assessment and foodborne hazards
Combine intake, clinical, anthropometric and laboratory evidence.
Distinguish infection, preformed toxin and chemical contamination.
Apply validated process controls rather than universal cooking recipes.
A population reference intake is not an individual diagnostic cutoff.
Dose, biotransformation and risk assessment
Separate intrinsic hazard from exposure-dependent risk.
Biotransformation can activate as well as detoxify compounds.
NOAEL and LD50 are study-dependent endpoints, not universal safe doses.
An antidote name is not a complete emergency treatment plan.
Surveillance, outbreak response and immunization
Use explicit, versioned case definitions and comparable denominators.
Descriptive patterns generate hypotheses that need further evidence.
Separate theoretical transmission models from actual vaccination programme targets.
Care for urgent events and investigate causation without relying on timing alone.
Life-course prevention, equity and programme evaluation
Investigate structural barriers as well as individual knowledge.
Interpret growth and maternal indicators with the correct reference and denominator.
Screening benefit requires follow-up, not detection counts alone.
Distinguish programme outputs, intermediate outcomes and population effects.