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🏥 FMGE Exam - PSM (Community Medicine) Complete Guide

Source: Park's Textbook of Preventive and Social Medicine + FMGE PYQ Analysis

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📌 TOPIC 1: LEVELS OF PREVENTION ⭐⭐⭐ (Bahut Zyada Important)

• "Impotency fear se vaccine na lena" = Cultural barrier (PYQ)
• Population strategy vs High-risk strategy = Primary prevention ke 2 approaches

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📌 TOPIC 2: EPIDEMIOLOGICAL MEASUREMENTS ⭐⭐⭐

Rates, Ratios, Proportions

• Rate = Events/Population at risk x multiplier (time factor included)
• Ratio = Two independent numbers ka comparison
• Proportion = Part/Whole (no time factor, expressed as %)

Key Rates (FMGE Favorite):

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📌 TOPIC 3: STUDY DESIGNS ⭐⭐⭐

Types of Epidemiological Studies:

Descriptive → Time, Place, Person (3 Ps)
  ├── Cross-sectional (prevalence study) - snapshot
  ├── Case-Control - looks BACKWARD (retrospective), Odds Ratio
  └── Cohort - looks FORWARD (prospective), Relative Risk / RR

• RCT (Randomized Controlled Trial) - Gold Standard
• Field Trial, Community Trial

FMGE Key Points:

• Case-Control: Rare diseases ke liye best, calculates Odds Ratio
• Cohort: Incidence calculate kar sakta hai, Relative Risk (RR)
• Cross-sectional: Prevalence batata hai
• Berkson's bias = Hospital-based case control mein hota hai
• RCT = Highest level of evidence

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📌 TOPIC 4: BIOSTATISTICS ⭐⭐⭐

Skewness (Bahut Important PYQ):

• Positive skew (right skew): Mean > Median > Mode
• Negative skew (left skew): Mean < Median < Mode
• Normal distribution: Mean = Median = Mode

Scales of Measurement (PYQ came):

Tests:

• Sensitivity = TP / (TP + FN) - Disease wale detect karne ki ability
• Specificity = TN / (TN + FP) - Healthy ko correctly identify karna
• High sensitivity = Good for Screening
• High specificity = Good for Confirmation

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📌 TOPIC 5: IMMUNIZATION & COLD CHAIN ⭐⭐⭐

National Immunization Schedule - Birth pe kya dete hain: (PYQ)

• BCG (birth/within 1 month)
• OPV-0 (birth/within 2 weeks)
• Hepatitis B (birth/within 24 hours)

Cold Chain - Critical Points:

• Definition: Vaccines ko manufacturer se field tak low temperature mein store/transport karna
• Temperature: Vaccines +2°C to +8°C mein store karna
• Freeze-sensitive vaccines (freeze karne par kharab ho jaate hain):
  • Hepatitis B, DPT, TT, DT, IPV, HPV, Pentavalent
• Heat + Light sensitive vaccines:
  • BCG, Measles, MMR, Rubella (dark glass vials mein aate hain)
• Vaccine Vial Monitor (VVM) = Appropriate Technology ka principle (PYQ)

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📌 TOPIC 6: HERD IMMUNITY ⭐⭐

"Vaccination of a portion of population provides protection to unprotected individuals"

• Herd immunity threshold = Minimum % of population that must be immune to stop disease spread
• Tetanus mein herd immunity kaam nahi karti (spores soil mein hote hain)
• Smallpox eradication mein herd immunity + surveillance + containment dono important the

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📌 TOPIC 7: NUTRITION ⭐⭐

Vitamin Deficiencies (Repeated PYQs):

Underweight/Malnutrition (PYQ: 68%):

• Underweight in India (NFHS data) ~35-36% children under 5
• Kwashiorkor = Protein deficiency (edema, moon face)
• Marasmus = Calorie deficiency (wasting, baggy pants appearance)

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📌 TOPIC 8: OCCUPATIONAL DISEASES ⭐⭐

Occupational Cancers (PYQ):

• Aniline dyes + Bladder cancer = Transitional Cell Carcinoma (dye industry workers)
• Asbestos = Mesothelioma + Lung cancer

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📌 TOPIC 9: HEALTH PROGRAMS & INDICATORS ⭐⭐

ESI (Employees' State Insurance) Benefits (PYQ):

• Sickness benefit, Maternity benefit, Disablement benefit, Dependent's benefit
• Medical benefit = ESI ka sabse important benefit (PYQ answer)

Primary Health Centre (PHC):

• Population served: 30,000 (plains), 20,000 (hilly/tribal)
• PHC = First contact point for curative + preventive care

Postnatal Visits (PYQ):

• Home delivery ke baad = 7 visits (Days 1, 3, 7, 14, 21, 28, 42)

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📌 TOPIC 10: HEALTH EDUCATION & BEHAVIOR CHANGE ⭐⭐

Adoption of Innovation (Stages - PYQ):

Types of Learning (PYQ):

• Cognitive = Knowledge/facts
• Affective = Attitude/feelings
• Psychomotor = Skills/demonstration (e.g., knee reflex teaching = Psychomotor learning)

Barriers to Health Education:

• Fear of impotency from vaccine = Cultural barrier (PYQ)
• Physical, Environmental, Cultural, Physiological barriers

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📌 TOPIC 11: WATER & ENVIRONMENTAL HEALTH ⭐⭐

• Fecal contamination indicator (recent): Fecal streptococci (more specific than coliforms) - PYQ
• McArdle's Index = Air quality measurement (PYQ)
• Chlorination = Primary water disinfection method

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📌 TOPIC 12: DISEASE CONTROL CONCEPTS ⭐⭐

• Leprosy = 3-5 years (can be up to 20 years)
• Rabies = Shorter incubation = Worse prognosis (PYQ concept)
• Tetanus = Shorter incubation = Worse prognosis

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🎯 FMGE PSM Exam Strategy

1. Sabse pehle ye topics master karo: Levels of prevention, Epidemiological rates, Study designs, Vaccine schedule
2. PYQ pattern: ~60-70% questions concept-based hote hain jo pehle bhi aaye hain
3. No negative marking hai FMGE mein - har question attempt karo
4. Park's textbook ki definitions yaad karo exactly (especially rates/ratios)
5. National programs ek baar zarur padho: NHM, RNTCP, NVBDCP, Reproductive Health programs

Park's Textbook of Preventive and Social Medicine - Ye sabse authoritative source hai FMGE ke liye. Upar diye gaye sare explanations isi se hain.

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