---

• Topics 1-28 all answered in full detail - levels of prevention, RCT steps, indicators/HDI, ergonomics, PEM, ESI Act benefits, epidemiological triad, genetic counselling, case-control, cohort study, Vitamin A deficiency, investigation of epidemic, nutritional surveillance, etc.

• Topics 29-59 all answered - health education principles, sampling methods, solid waste disposal, natural history of disease, air pollution, herd immunity, AEFI list, COTPA, ANC nutrition, eradication vs elimination, measures of dispersion, attributable risk, etc.

• ESI Act (★★★★★★★★)
• Genetic Counselling (★★★★★★★★)
• Air Pollution (full pollutants, effects, control)
• Herd Immunity (with R₀ table)
• RCT steps with advantages/disadvantages

---

PART 1 - Topics 1 to 15 (K. Park)

---

1. Levels of Prevention & Modes of Intervention

• Prevents emergence of risk factors themselves
• Directed at children/youth before risk factors develop
• Example: discouraging smoking, unhealthy diet in children to prevent future hypertension/obesity
• Main intervention: individual and mass education

• "Action taken prior to onset of disease which removes the possibility that disease will ever occur"
• Acts in pre-pathogenesis phase
• Example: immunization, health education, safe water supply

• Early detection and prompt treatment
• Halts/reverses disease progression
• Example: cervical cancer screening, blood pressure screening

• Reduces disability and promotes rehabilitation
• Example: physiotherapy after stroke, prosthetics after amputation

1. Health promotion - education, lifestyle modification, nutrition
2. Specific protection - immunization, chemoprophylaxis, use of PPE
3. Early diagnosis & treatment - screening programs
4. Disability limitation - adequate treatment to prevent complications
5. Rehabilitation - physical, social, vocational

---

2. Classification of Epidemiological Study Designs + Steps of RCT

Observational:
  Descriptive: Case report, Case series, Cross-sectional
  Analytical:
    Case-Control (retrospective)
    Cohort (prospective/retrospective)
    Ecological/Correlational
Experimental:
  RCT
  Field trials
  Community trials
  Quasi-experimental

1. Formulate clear hypothesis
2. Define inclusion/exclusion criteria; select study population
3. Collect baseline data
4. Randomization - random allocation to treatment/control groups
5. Blinding - single/double/triple blind
6. Administer intervention to experimental group; placebo to control
7. Follow-up both groups
8. Assess outcomes
9. Statistical analysis (RR, NNT)

• Single blind: subject unaware
• Double blind: subject + investigator unaware (gold standard)
• Triple blind: subject + investigator + data analyst unaware

---

3. Characteristics of Indicators + HDI + Morbidity/Mortality/Disability Indicators

• Valid, Reliable, Sensitive, Specific, Relevant, Feasible, Understandable

1. Mortality: CDR, IMR (most sensitive indicator of health), U5MR, MMR, PYLL
2. Morbidity: Incidence rate, Prevalence rate, Attack rate
3. Disability: DALY (YLL + YLD), Sullivan's index
4. Nutritional: Anthropometric measurements
5. Health service: Doctor-population ratio, bed-population ratio

• Composite index by UNDP
• Three dimensions:
  1. Health = Life expectancy at birth
  2. Education = Mean years + expected years of schooling
  3. Standard of living = GNI per capita (PPP)
• Scale: 0 to 1
• Very High ≥0.8 | High 0.7-0.8 | Medium 0.55-0.7 | Low <0.55

---

4. Ergonomics

• Prevents occupational injuries, MSDs (most common occupational problem)
• Reduces fatigue and physical strain
• Improves productivity and work efficiency
• Prevents repetitive strain injuries
• Reduces absenteeism and errors
• Designs tools/workstations to suit human anatomy

---

5. PEM - Causes, Prevention, Epidemiology, Under-5 Assessment

• Kwashiorkor - protein deficiency predominant (oedema, skin changes, flag sign in hair)
• Marasmus - energy deficiency predominant (severe wasting, "old man face")
• Marasmic Kwashiorkor - mixed

1. Weight-for-age → Gomez classification (Grade I: 75-89%, II: 60-74%, III: <60%)
2. Height-for-age → stunting (<-2 SD)
3. Weight-for-height → wasting (<-2 SD)
4. MUAC: <12.5 cm = SAM; 12.5-13.5 cm = MAM
5. Road-to-Health card (growth monitoring)
6. Waterlow classification

---

6. Measures of Central Tendency & Limitations

1. Mean = Sum ÷ N; most used; limitation: affected by outliers/skewed data
2. Median = Middle value; not affected by extremes; limitation: ignores actual values
3. Mode = Most frequent value; limitation: may not be unique or may not exist

---

7. Secondary Attack Rate (SAR)

SAR = (New cases in contacts within incubation period) / (Total susceptible contacts exposed) × 100

---

8. Louis Pasteur

• French microbiologist (1822-1895)
• Proved germ theory of disease
• Developed pasteurization of milk
• Created vaccines for fowl cholera, anthrax, and rabies
• Disproved spontaneous generation
• Father of modern bacteriology and immunology
• Concept of attenuation of microorganisms

---

9. ESI Act 1948

1. Sickness benefit - 70% wages for 91 days/year
2. Maternity benefit - 100% wages for 26 weeks
3. Disablement benefit - Temporary (90% wages till recovery); Permanent (lifetime, proportionate)
4. Dependants' benefit - 90% wages to family on work-related death
5. Medical benefit - Full medical care for insured + family (no ceiling)
6. Funeral expenses - ₹15,000 lump sum

---

10. Epidemiological Triad

• Biological (bacteria, virus, fungi, parasites)
• Physical (heat, radiation, noise, trauma)
• Chemical (toxins, drugs, pollutants)
• Nutritional (excess or deficiency)

• Age, sex, genetic constitution
• Immunity, nutrition, habits (smoking, diet)
• Occupation, lifestyle

• Physical: climate, geography, water supply
• Biological: vectors, animal reservoirs
• Socioeconomic: poverty, overcrowding, sanitation

---

11. Genetic Counselling

• Advanced maternal age (>35 yrs) - Down's syndrome risk
• Previous child with chromosomal abnormality
• Family history of genetic disorder
• Consanguineous marriage
• Teratogen/radiation exposure
• Repeated unexplained abortions

1. Accurate diagnosis
2. Determine inheritance pattern
3. Estimate recurrence risk
4. Explain risks clearly
5. Discuss options (prenatal diagnosis, adoption, ART)
6. Psychological support
7. Follow-up

---

12. Positive Health

---

13. Acculturation & Culture

---

14. Case-Control Study

1. Select cases (confirmed diagnosis)
2. Select controls (matched for age, sex)
3. Measure past exposure
4. Compare exposure between cases and controls
5. Calculate Odds Ratio

OR = (a×d)/(b×c) from 2×2 table

• OR >1: risk factor | OR <1: protective | OR =1: no association

---

15. Occupational Diseases

1. Pneumoconioses - silicosis, asbestosis, coal workers' pneumoconiosis, byssinosis
2. Occupational cancers - lung (asbestos), bladder (aniline dyes), mesothelioma
3. Dermatoses - contact dermatitis
4. MSDs - back pain, repetitive strain injury
5. NIHL - noise-induced hearing loss
6. Chemical poisonings - lead, mercury, arsenic, pesticides
7. Infections - anthrax, leptospirosis, brucellosis
8. Psychological - stress, burnout

• ESI Act 1948 - medical + cash benefits
• Factories Act 1948 - health, safety, welfare
• Mines Act 1952

---

PART 2 - Topics 16 to 30

---

16. Cohort Study + Cohort vs Case-Control

• Relative Risk (RR) = Incidence exposed / Incidence unexposed
• Attributable Risk (AR) = Incidence exposed - Incidence unexposed

---

17. Role of Family + Emotions in Health

• Psychosomatic disorders: peptic ulcer, hypertension, asthma, eczema
• Stress → immune suppression
• Positive emotions → improved healing and immunity
• Grief/loss → bereavement disorders

---

18. Integrated Vector Control

1. Biological: Bti, larvivorous fish (Gambusia), copepods
2. Chemical: DDT, pyrethroids, temephos (larvicide)
3. Environmental management:
   • Modification: drainage, landfill
   • Manipulation: changing water levels, removing stagnant water
4. Personal protection: ITNs (insecticide-treated nets), repellents, protective clothing
5. Legislation: anti-mosquito bylaws

---

19. Definition of Health + Determinants + Spectrum + Dimensions

---

20. Indian Reference Man/Woman

• Man: 20-39 yrs, 60 kg, healthy, moderately active, temperate climate (10-20°C)
• Woman: 20-39 yrs, 55 kg, same conditions
• Used as standard for ICMR Recommended Dietary Allowances (RDA)

---

21. Superchlorination

• Bleaching powder (33% available Cl₂) - dose 2-4 kg/1000 gallons
• High Test Hypochlorite (HTH) - 60-70% available Cl₂
• Sodium hypochlorite
• Chlorine gas
• Chloramine (stable, persistent)

---

22. Vitamin A Deficiency (Xerophthalmia)

• XN - Night blindness (first and earliest sign)
• X1A - Conjunctival xerosis
• X1B - Bitot's spots (foamy triangular spots)
• X2 - Corneal xerosis
• X3A - Corneal ulceration <1/3
• X3B - Corneal ulceration ≥1/3 (keratomalacia)
• XS - Corneal scar
• XF - Xerophthalmic fundus

• Increased susceptibility to measles, diarrhoea, ARI
• Growth retardation
• Follicular hyperkeratosis ("toad skin")
• Impaired immunity
• Anaemia, increased child mortality

• <6 months: 50,000 IU
• 6-12 months: 1,00,000 IU

• 1 year: 2,00,000 IU every 6 months

---

23. Pre-placement & Periodic Medical Exam

---

24. Incidence vs Prevalence

---

25. Lead Time

---

26. Investigation of Epidemic

1. Verify/establish diagnosis
2. Confirm existence of epidemic
3. Define cases (standard case definition)
4. Find all cases (active search)
5. Descriptive epidemiology: Person, Place, Time
6. Formulate hypothesis (source, vehicle, mode)
7. Test hypothesis (case-control/cohort study)
8. Evaluate hypothesis against all facts
9. Implement control measures
10. Write and communicate report

---

27. Disinfection

1. Concurrent - during illness (ongoing disinfection)
2. Terminal - after patient leaves/recovers/dies
3. Prophylactic - e.g., chlorination of water, pasteurization
4. Fumigation - rarely used now

---

28. Nutritional Surveillance + Anthropometric Indices

1. Weight-for-age: Gomez (I: 75-89%, II: 60-74%, III: <60%); IAP classification
2. Height-for-age: stunting (<-2 SD)
3. Weight-for-height: wasting (<-2 SD)
4. MUAC: SAM <12.5 cm; MAM 12.5-13.5 cm
5. Head circumference/chest circumference ratio: H/C <1 after 6 months = malnutrition
6. Triceps skinfold thickness

1. PEM | 2. Vitamin A deficiency | 3. Iron deficiency anaemia | 4. IDD | 5. Rickets (Vit D) | 6. Zinc deficiency

---

PART 3 - Topics 29 to 45

---

29. Principles of Health Education

1. Credibility - based on facts
2. Interest - relevant to audience
3. Participation - active involvement
4. Comprehension - simple, clear language
5. Reinforcement - repeat messages
6. Motivation - address real needs
7. Cultural appropriateness
8. Learning by doing
9. Known to unknown
10. Realistic goals

• Predisposing factors: knowledge, attitudes, beliefs
• Enabling factors: resources, skills
• Reinforcing factors: peer support, social reward

---

30. Sampling Methods + Errors

1. Simple Random Sampling - equal chance; lottery/random number tables
2. Systematic sampling - every nth individual
3. Stratified Random - divide into strata, sample from each (ensures representation)
4. Cluster sampling - randomly select clusters
5. Multi-stage sampling (used in NFHS)

• Type I (α error): Reject H₀ when true (false positive)
• Type II (β error): Accept H₀ when false (false negative)
• Sampling error reduced by increasing sample size
• Bias = systematic error (not reduced by larger sample)

---

31. Solid Waste Disposal

1. Sanitary landfill - most common; compacted with soil layers
2. Incineration - burns waste; reduces volume 80-90%; costly; air pollution risk
3. Composting - NADEP/Bangalore method; biodegradable → manure
4. Vermicomposting - using earthworms
5. Biogas - anaerobic digestion
6. Recycling
7. Pyrolysis - thermal decomposition without oxygen

• Yellow: incinerable | Red: autoclavable | White: sharps | Blue: glassware

---

32. Chalk & Talk - Disadvantages

• One-way communication only
• No active learner participation
• Teacher-centred, not learner-centred
• Poor retention of information
• Cannot address individual misconceptions
• Monotonous; poor motivation
• Limited to cognitive domain; no skill development
• No immediate feedback

---

33. Broken & Problem Family

---

34. Blinding Types

• Single blind: subject unaware → reduces placebo effect
• Double blind: subject + investigator unaware → prevents observer and performance bias (gold standard)
• Triple blind: subject + investigator + analyst unaware → prevents analysis bias

---

35. Spot Map

---

36. Prevention of Mental Health + Signs of Poor Mental Health

• Primordial: promote healthy societal conditions
• Primary: stress management, parenting skills, anti-stigma
• Secondary: NMHP screening, early treatment
• Tertiary: rehabilitation, community reintegration

• Persistent sadness, anxiety, excessive worry
• Sleep and appetite changes
• Social withdrawal
• Inability to function daily
• Substance abuse
• Suicidal ideation

---

37. Hazards of BMW

1. Infectious hazards - HBV, HCV, HIV, TB from sharps/body fluids
2. Sharps injuries - needlestick injuries (most common occupational risk in healthcare)
3. Chemical hazards - cytotoxic drugs, disinfectants, mercury
4. Radioactive hazards - nuclear medicine waste
5. Genotoxic - antineoplastic agents

---

38. Sanitary Barrier

1. Isolation of case
2. Quarantine of contacts
3. Disinfection of environment
4. Personal hygiene (handwashing)
5. Safe water and food
6. Vector control
7. Immunization

---

39. Natural History of Disease

• Agent-host-environment interaction
• No disease yet in man
• Intervention: Primordial + Primary prevention

• Early (sub-clinical/incubation period) → Secondary prevention
• Advanced (signs + symptoms) → Secondary prevention
• Outcome: Recovery / Disability / Death → Tertiary prevention

---

40. Greenhouse Effect & Global Warming

• Heat waves → heat-related deaths
• Vector expansion → malaria, dengue in new areas
• Extreme weather - floods, droughts
• Food insecurity from crop failures
• Sea level rise → population displacement
• Water scarcity

---

41. Health & Disease - Social/Cultural Factors + Culture Contact

• Social factors: Income, education, employment, social support affect health outcomes
• Cultural factors: Food habits, gender roles, health beliefs, traditional medicine
• Culture contact: Meeting of cultures can improve (e.g., adopting hygiene practices) or harm health (e.g., adopting unhealthy Western diets)
• Example: Belief that colostrum is "bad" → discard → infant malnutrition

---

42. Drug Addiction

• Primary: education, legislation, restrict availability
• Secondary: screening, brief interventions
• Tertiary: detoxification, rehabilitation, de-addiction centres

---

43. Measures of Variation/Dispersion

1. Range = Max - Min; simple but affected by extremes
2. Mean Deviation = average absolute deviation from mean
3. Variance = average squared deviation from mean
4. Standard Deviation (SD) = √Variance; most useful; same units as data
5. Coefficient of Variation (CV) = (SD/Mean) × 100%; compares variability between datasets
6. Interquartile Range (IQR) = Q3 - Q1; used with median; not affected by outliers

---

44. Attributable Risk

• AR = Incidence (exposed) - Incidence (unexposed)
• AR% = AR / Incidence (exposed) × 100
• PAR = Incidence (total population) - Incidence (unexposed)
• PAR% = PAR / Total incidence × 100

---

45. Standard Normal Curve & Normal Distribution

• Bell-shaped, symmetrical
• Mean = Median = Mode
• Mean ± 1 SD = 68.27% of observations
• Mean ± 2 SD = 95.45% of observations
• Mean ± 3 SD = 99.73% of observations

• Mean = 0, SD = 1
• Z-score = (X - μ) / σ
• Used for: reference ranges, growth chart cutoffs, statistical testing

---

PART 4 - Topics 46 to 59

---

46. Air Pollution (Comprehensive)

• Acute: eye/nose/throat irritation, asthma exacerbation
• Chronic: COPD, lung cancer, cardiovascular disease
• Children: impaired lung development

• BS-VI vehicle emission standards
• Industrial scrubbers and filters
• NAAQS (National Ambient Air Quality Standards)
• Ujjwala scheme - clean cooking fuel
• AQI (Air Quality Index) monitoring

---

47. Euthenics & Eugenics

• Improvement of human species through improvement of environment
• Focus: nutrition, sanitation, education, housing
• "Man improves when environment improves"

• Improvement of human species through selective reproduction
• Positive eugenics: encourage reproduction of "fit" individuals
• Negative eugenics: discourage reproduction of "unfit" individuals
• Ethically controversial; abused by Nazis
• Modern form: genetic counselling (voluntary, non-coercive)

---

48. Sound/Noise Pollution

• Auditory: NIHL (gradual, irreversible), Tinnitus, 4000 Hz notch on audiogram
• Non-auditory: Hypertension, IHD, sleep disturbance, stress, irritability, reduced work performance

1. At source: quieter machinery, mufflers, engineering controls
2. In path: barriers, insulation, distance
3. At receiver: earmuffs, earplugs, audiometric monitoring, job rotation

---

49. Milk - Deficient Elements

1. Iron - very low → iron deficiency anaemia in exclusively milk-fed infants
2. Vitamin C - destroyed by boiling/pasteurization
3. Vitamin D - low → rickets without sun exposure
4. Manganese
5. Zinc (relatively low)

---

50. Serial Interval

• Differs from incubation period (infection → symptom onset)
• Helps understand transmission dynamics
• If serial interval < incubation period: pre-symptomatic transmission occurs (e.g., COVID-19)
• Used to calculate R₀ and plan interventions

---

51. Sickness Absenteeism

---

52. Household/Small Scale Water Purification

1. Boiling - most effective; kills all pathogens at 100°C; no residual protection
2. Bleaching powder / chlorine tablets - residual 0.5 mg/L after 30 min
3. Iodine tablets
4. Potassium permanganate - unreliable for viruses
5. SODIS (Solar Disinfection) - PET bottles in sunlight 6+ hours
6. Candle filters/ceramic filters
7. Biosand filters
8. UV treatment

---

53. ANC - 2nd Trimester Nutrition

• Energy: +350 kcal/day (2nd trimester); +450 kcal/day (3rd trimester)
• Protein: +23 g/day
• Iron: 35 mg/day → IFA supplement 100 mg Fe + 500 μg folic acid daily
• Folic acid: 400-500 μg/day (prevents NTDs)
• Calcium: 1200 mg/day
• Iodine: 220 μg/day
• Vitamin A: 600-800 μg/day

---

54. Eradication vs Elimination

---

55. Herd Immunity

HIT = 1 - 1/R₀

---

56. Joint Family

• Multi-generational family living together, sharing resources
• Advantages: Child care, elder care, emotional support, economic pooling
• Disadvantages: Overcrowding → spread of TB and other communicable diseases; family conflict; stress
• Urbanization and migration → shift toward nuclear families

---

57. AEFI - List & Classification

1. Vaccine-related reaction - inherent property of vaccine
2. Programme error - contamination, wrong dose, route, diluent
3. Coincidental - unrelated to vaccine
4. Injection reaction - vasovagal, anxiety-related

• OPV: VAPP (1 in 2.7 million doses)
• BCG: local abscess, lymphadenitis
• DTP: fever, local swelling, hypotonic hyporesponsive episode
• MMR: mild rash, fever, arthralgia
• Hep B: anaphylaxis (rare)

---

58. Barriers to Communication

1. Physical/Environmental: noise, distance, poor lighting
2. Semantic: language differences, jargon, ambiguous messages
3. Psychological: fear, anxiety, distrust, prejudice
4. Cultural: health beliefs, gender roles, traditional values
5. Attitudinal: apathy, negative attitude of health workers
6. Literacy: low literacy → cannot read health materials
7. Organizational: poor coordination, inadequate feedback

---

59. COTPA + Health Effects of Tobacco

• Section 4: No smoking in public places
• Section 5: No tobacco advertising
• Section 6: No sale to persons under 18 yrs; no sale within 100 m of educational institutions
• Mandatory graphic health warnings on all tobacco products

• Cancer: Lung, oral, larynx, pharynx, oesophagus, bladder, pancreas, kidney
• CVS: IHD, stroke, peripheral vascular disease
• Respiratory: COPD, chronic bronchitis, emphysema
• Reproductive: Reduced fertility, LBW, IUFD
• Other: Peptic ulcer, osteoporosis, premature ageing

---

• All definitions from K. Park
• Classifications with examples
• Steps/procedures
• Advantages/disadvantages
• Formulae where needed
• Tables for comparison topics

• Which topic number(s) felt more detailed before?
• What extra information do you remember seeing?