NEET PG Rapid Revision
Community Medicine (PSM) One-Liners for NEET PG: Rapid Revision
High-yield community medicine one-liners for NEET PG covering biostatistics, epidemiology, national health programmes and preventive medicine.
MedNext Academy | 6 min read
Community Medicine (PSM) One-Liners for NEET PG: Rapid Revision
High-yield community medicine one-liners for NEET PG covering biostatistics, epidemiology, national health programmes and preventive medicine.
Community Medicine (PSM): rapid revision one-liners for NEET PG
Community Medicine (Preventive and Social Medicine) is a major contributor to the NEET PG question paper. It covers epidemiology, biostatistics, nutrition, national health programmes, maternal and child health, communicable diseases and environmental health.
These one-liners focus on definitions, cut-off values, national programme targets and epidemiological measures that are asked directly in the exam. PSM rewards precise numerical recall.
Must-know one-liners
- Incidence measures NEW cases; prevalence measures ALL existing cases at a point or period
- Prevalence = Incidence x Duration (for stable populations)
- Sensitivity is the ability of a test to correctly identify those with the disease (true positive rate)
- Specificity is the ability of a test to correctly identify those without the disease (true negative rate)
- Positive predictive value depends on the prevalence of the disease in the population
- Odds ratio is the measure of association in case-control studies
- Relative risk is the measure of association in cohort studies
- Number needed to treat (NNT) = 1 / absolute risk reduction
- Type I error (alpha) is rejecting the null hypothesis when it is true (false positive); Type II error (beta) is accepting the null hypothesis when it is false (false negative)
- Power of a study = 1 - beta (probability of correctly rejecting a false null hypothesis)
- The chi-square test is used for comparing proportions (categorical data)
- The t-test is used for comparing means of two groups (continuous data)
- ANOVA is used for comparing means of three or more groups
- Standard deviation measures the dispersion of data around the mean; in a normal distribution, 68.3% of values lie within 1 SD, 95.4% within 2 SD
- Median is the preferred measure of central tendency for skewed data
- Primary prevention prevents occurrence of disease (immunisation, health education); secondary prevention involves early detection and treatment (screening); tertiary prevention reduces disability and rehabilitation
- Herd immunity threshold varies by disease; for measles it is approximately 95%
- The cold chain maintains vaccines at 2-8 degrees C; OPV and measles vaccine are the most heat-sensitive in the UIP
- BCG vaccine is given at birth or as early as possible; it is the only vaccine that leaves a scar
- Under the Universal Immunisation Programme, pentavalent vaccine (DPT + HepB + Hib) is given at 6, 10 and 14 weeks
- Rotavirus vaccine is given at 6, 10 and 14 weeks along with pentavalent (in selected states under UIP)
- Measles-Rubella (MR) vaccine has replaced measles vaccine in the UIP; given at 9-12 months and 16-24 months
- PCV (pneumococcal conjugate vaccine) is given at 6 weeks, 14 weeks and 9 months under UIP
- Japanese encephalitis vaccine is given in endemic districts at 9-12 months and 16-24 months
- ORS composition (WHO new formula): 245 mOsm/L, reduced osmolarity with 75 mmol/L sodium and 75 mmol/L glucose
- IMNCI (Integrated Management of Neonatal and Childhood Illness) classifies sick children into colour-coded categories: pink (urgent referral), yellow (treat at facility), green (home care)
- ASHA (Accredited Social Health Activist) is a community health volunteer under the National Health Mission; one per 1000 population
- Anganwadi worker is the key functionary of ICDS (Integrated Child Development Services) scheme
- ICDS provides six services: supplementary nutrition, immunisation, health check-ups, referral services, nutrition and health education, pre-school education
- BMI cut-offs (WHO for Asian populations): underweight < 18.5, normal 18.5-22.9, overweight 23-24.9, obese >= 25
- MUAC (mid-upper arm circumference) < 11.5 cm indicates severe acute malnutrition in children 6-59 months
- Weight-for-height Z-score below -3 SD indicates severe wasting (severe acute malnutrition)
- Protein-energy malnutrition: Kwashiorkor (protein deficiency, oedema, flaky-paint dermatosis) vs Marasmus (total calorie deficiency, severe wasting)
- Bitot spots and night blindness indicate vitamin A deficiency; WHO classification grades xerophthalmia from X1A to XS
- Iodine deficiency is assessed by urinary iodine excretion; goitre prevalence below 5% in a community indicates iodine sufficiency
- Total goitre rate above 5% in 6-12 year old children defines endemic goitre
- Fluorosis occurs when water fluoride exceeds 1.5 mg/L; causes dental mottling and skeletal fluorosis
- Safe water means water free from pathogenic organisms and harmful chemicals; residual chlorine of 0.5 mg/L at the consumer end
- Chlorine demand + residual chlorine = chlorine dose (Horrock apparatus is used for field testing)
- Most probable number (MPN) method estimates coliform count in water; coliform count should be 0/100 mL in treated water
- Millennium Development Goals have been succeeded by Sustainable Development Goals (17 SDGs, 169 targets, adopted in 2015)
- Infant mortality rate (IMR) = deaths under 1 year / 1000 live births; it is the most sensitive indicator of health status of a community
- Maternal mortality ratio (MMR) = maternal deaths / 100,000 live births
- Crude birth rate (CBR) and crude death rate (CDR) are expressed per 1000 mid-year population
- Total fertility rate (TFR) of 2.1 is considered replacement level
- Demographic transition has 4 stages: high stationary, early expanding, late expanding, low stationary
- National Health Policy 2017 aims to raise public health expenditure to 2.5% of GDP
- RNTCP (Revised National Tuberculosis Control Programme) has been renamed NTEP (National Tuberculosis Elimination Programme); target elimination by 2025
- NVBDCP (National Vector Borne Disease Control Programme) covers malaria, dengue, chikungunya, kala-azar, filariasis and Japanese encephalitis
- API (Annual Parasite Incidence) = confirmed malaria cases per 1000 population per year
- Kala-azar elimination target: < 1 case per 10,000 population at sub-district level
- John Snow is considered the father of modern epidemiology (Broad Street pump, cholera investigation, 1854)
How to use these one-liners
PSM one-liners are best revised in thematic blocks: epidemiology and biostatistics in one sitting, national health programmes in another, nutrition in a third. Many questions in PSM are numerical -- cut-off values, programme targets, vaccine schedules -- so focus on these.
For biostatistics, work through a few practice problems after reviewing the definitions. Knowing the definition is necessary, but being able to apply it to a data table is what the exam tests.
Key mnemonics
DANISH for raised anion gap metabolic acidosis: Diabetic ketoacidosis, Alcohol (methanol/ethylene glycol), Niacin deficiency/Nutritional (starvation), Isoniazid/Iron, Salicylates, Hypoxia/Hypotension (lactic acidosis). (Note: some versions use MUDPILES.)
ICDS provides 6 services -- remember as NIHR-PP: Nutrition supplementation, Immunisation, Health check-ups, Referral, Pre-school education, health and nutrition education to Parents.
Sensitivity = Sn-N-Out: when Sensitivity is high, a Negative result rules OUT the disease. Specificity = Sp-P-In: when Specificity is high, a Positive result rules IN the disease.
Revision schedule
Community medicine is vast. Break revision into 4 blocks: (1) epidemiology + biostatistics, (2) nutrition + environmental health, (3) national programmes + vaccines, (4) MCH + demography. Revise one block every 2 days, cycling through all four over a week. In the final week, focus on vaccine schedules and programme-specific numerical targets.
Frequently Asked Questions
How important is biostatistics for NEET PG?
Very important. Expect 4-6 questions on study design, measures of association (odds ratio, relative risk), sensitivity/specificity and statistical tests. These are conceptual questions that require understanding, not just memorisation.
Do I need to remember all national health programme targets?
Focus on the major programmes: NTEP (tuberculosis), NVBDCP (vector-borne diseases), NPCB (blindness), UIP (immunisation), and reproductive and child health. Know the key targets and indicators for each.
Are vaccine schedule questions common?
Yes, vaccine schedules under the Universal Immunisation Programme are tested almost every year. Know the age and route of administration for each vaccine. Recent additions like PCV and rotavirus are especially likely to be asked.
Which PSM textbook is best for NEET PG?
Park (K. Park) is the gold standard reference. For exam-focused preparation, Vivek Jain or Rajesh Yadav provide concise coverage. One-liners are ideal for the final revision push.
Inside MedNext for this topic
- 411 MedNext-authored chapters
- 80,000+ MCQ bank
- 15 study modes
- Growing visual cheat sheets
Study modes
- Notes
- MCQ
- Audio
- Video
- Visual
- 3D Anatomy
- Trace
- Flashcards
- Mnemonics
- Image Bank
- Clinical
- Microscopy
- Audio QBank
- Cadaver
- Book Match
Continue reading
NEET PG StrategyHow to Prepare Community Medicine (PSM)
Study strategy, time allocation and high-yield topics.
NEET PG PYQCommunity Medicine (PSM) PYQ Analysis
Previous year question trends and patterns.
Subject HubCommunity Medicine (PSM) Hub
All Community Medicine (PSM) resources in one place.
Test your Community Medicine (PSM) revision
You have read the one-liners. Now test whether they stuck -- a quick recall quiz on this subject takes five minutes and shows what needs another pass.
Test this revision