NExT Community Medicine and Public Health (Preventive and Social Medicine) Syllabus

Community Medicine and Public Health (Preventive and Social Medicine) syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Community Medicine and Public Health (Preventive and Social Medicine) in NExT, not a summary of it.

1. 1

   Epidemiology and Biostatistics

   5 topics

   • Concepts and Measurements in Epidemiology
     • Incidence, prevalence, morbidity and mortality rates
   • Epidemiological Study Designs
     • Cohort, case-control, RCT, cross-sectional
   • Screening and Diagnostic Tests
     • Sensitivity, specificity, predictive values
   • Biostatistics
     • Sampling, tests of significance, normal distribution
   • Investigation and Control of Epidemics
2. 2

   Communicable and Non-Communicable Diseases

   4 topics

   • Epidemiology of Communicable Diseases
     • TB, malaria, dengue, COVID-19, HIV
   • Vaccine-Preventable Diseases and Cold Chain
   • Non-Communicable Diseases
     • Diabetes, hypertension, cancer, CVD prevention
   • Zoonoses and Emerging Infections
3. 3

   National Health Programs and Policy

   4 topics

   • National Health Programs
     • NTEP, NVBDCP, NACO, NPCDCS
   • Maternal and Child Health Programs
     • RMNCH+A, JSY, ICDS
   • Health Policy and Health Systems
     • National Health Policy, Ayushman Bharat, HWCs
   • Health Care Delivery and Three-Tier System
4. 4

   Environmental Health, Nutrition and Occupational Health

   4 topics

   • Water, Sanitation and Air Pollution
     • Water purification, waste disposal
   • Nutrition and Public Health
     • Balanced diet, nutritional assessment, deficiency disorders
   • Occupational Health and Diseases
     • Occupational hazards, ESI Act
   • Disaster Management and Entomology
5. 5

   Demography, Social Sciences and Health Management

   4 topics

   • Demography and Family Planning
     • Demographic cycle, population dynamics, contraception
   • Social and Behavioral Sciences
     • Social determinants, health education, IEC
   • Health Information and Vital Statistics
   • International Health and SDGs

Community Medicine and Public Health (Preventive and Social Medicine) flashcards for NExT

24 of 50 cards from the Community Medicine and Public Health (Preventive and Social Medicine) deck — real questions with worked answers.

1. Define incidence rate and state its formula.

   Incidence rate = number of NEW cases of a disease occurring in a defined population during a specified period, divided by the total person-time at risk. It measures the rate of occurrence of new disease (force of morbidity).

2. What is the formula for point prevalence, and how does it relate to incidence and duration?

   Point prevalence = (number of existing cases at a point in time / total population at that time). For chronic conditions in a steady state: Prevalence ≈ Incidence × mean Duration (P = I × D).

3. Differentiate between the crude death rate and the standardized (age-adjusted) death rate.

   Crude death rate = total deaths/mid-year population × 1000; it is influenced by population age structure. The standardized rate removes the effect of differing age composition (by direct or indirect standardization), allowing valid comparison between populations.

4. What are sensitivity and specificity of a screening test, and what does each measure?

   Sensitivity = TP/(TP+FN) = ability to correctly identify those WITH disease (true positive rate). Specificity = TN/(TN+FP) = ability to correctly identify those WITHOUT disease (true negative rate).

5. How do positive predictive value (PPV) and disease prevalence relate?

   PPV = TP/(TP+FP). PPV rises as disease prevalence rises (and as specificity rises). In low-prevalence populations, even a highly sensitive/specific test gives a low PPV (many false positives).

6. What is the gold-standard analytical study design for establishing causation, and why?

   The randomized controlled trial (RCT). Randomization balances known and unknown confounders between groups, minimizing bias and allowing causal inference about the intervention's effect.

7. Compare cohort and case-control studies in terms of direction and measure of association.

   Cohort: prospective from exposure to outcome; yields incidence and Relative Risk (RR). Case-control: retrospective from outcome (disease) back to exposure; yields the Odds Ratio (OR) as an estimate of RR. Case-control is better for rare diseases; cohort for rare exposures.

8. Give the formula for Relative Risk (RR) and state what RR = 1, >1, and <1 indicate.

   RR = incidence in exposed / incidence in unexposed. RR = 1: no association; RR > 1: exposure increases risk; RR < 1: exposure is protective.

9. What is attributable risk (AR) and how is it calculated?

   Attributable risk = incidence in exposed − incidence in unexposed. It indicates the excess risk of disease attributable to the exposure (useful for assessing intervention impact).

10. Define a confounding variable and give two methods to control it.

    A confounder is associated with both the exposure and the outcome but is not an intermediate step in the causal pathway. Controlled at design by randomization, matching, restriction; at analysis by stratification and multivariable regression.

11. What is the difference between validity (accuracy) and reliability (precision) of a test?

    Validity = how well the test measures what it is intended to measure (sensitivity, specificity). Reliability/reproducibility = consistency of results on repeated measurement (affected by observer and instrument variation).

12. What is Yield in the context of a screening test?

    Yield = the number of new, previously unrecognized cases of disease detected and brought to treatment as a result of screening. It depends on sensitivity of the test, prevalence, and participation.

13. State the measures of central tendency and which is preferred for skewed data.

    Mean, median, and mode. For skewed (non-normal) distributions the median is preferred because it is not distorted by extreme outliers.

14. What is the standard error of the mean (SEM) and its formula?

    SEM measures the precision of the sample mean as an estimate of the population mean. SEM = standard deviation / √n. It decreases as sample size increases.

15. Define Type I and Type II errors in hypothesis testing.

    Type I error (α) = rejecting a true null hypothesis (false positive). Type II error (β) = failing to reject a false null hypothesis (false negative). Power = 1 − β.

16. Which statistical test compares means between two independent groups, and which compares proportions in a 2×2 table?

    Student's t-test (unpaired) compares means of two independent groups. The Chi-square test compares proportions/categorical data in a contingency table (use Fisher's exact test if expected cell counts are small).

17. What is a p-value, and what does p < 0.05 conventionally mean?

    The p-value is the probability of obtaining results at least as extreme as observed if the null hypothesis were true. p < 0.05 conventionally indicates statistical significance (less than 5% probability the result is due to chance).

18. What does a 95% confidence interval represent?

    A range that, on repeated sampling, would contain the true population parameter 95% of the time. For RR/OR, if the 95% CI includes 1.0, the association is not statistically significant.

19. List the steps in the investigation of an epidemic.

    1) Verify the diagnosis; 2) Confirm the existence of an epidemic; 3) Define and identify cases (case definition); 4) Describe by time, place, person; 5) Formulate and test hypotheses; 6) Implement control measures; 7) Evaluate and report.

20. Differentiate point-source, propagated, and continuous-source epidemic curves.

    Point-source (common source): single sharp peak within one incubation period. Propagated (person-to-person): series of progressively taller peaks one incubation period apart. Continuous common source: plateau-shaped curve over an extended period.

21. What is the secondary attack rate and its formula?

    Secondary attack rate = number of new cases among contacts within one incubation period of the primary case / total susceptible contacts × 100. It measures infectiousness and person-to-person spread.

22. Define basic reproduction number (R0) and herd immunity threshold.

    R0 = average number of secondary cases produced by one infectious case in a fully susceptible population. Herd immunity threshold = 1 − 1/R0; the proportion that must be immune to halt sustained transmission.

23. What is the incubation period, and why is it epidemiologically important?

    Incubation period = time interval between entry of the pathogen (infection) and onset of clinical symptoms. It helps identify the time/source of exposure, define quarantine duration, and interpret epidemic curves.

24. State the chemoprophylaxis drug and regimen used for close contacts of meningococcal meningitis.

    Rifampicin (600 mg twice daily for 2 days in adults) is the standard chemoprophylaxis; ciprofloxacin (single dose) or ceftriaxone are alternatives for close contacts.

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