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Chapter-wise Answers: Health Information, Biostatistics, Health Education, Health Planning & Management, International Health

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CHAPTER 20: HEALTH INFORMATION & BIOSTATISTICS

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LONG QUESTIONS

1. Health Information System (HIS)

1. The system should be population-based
2. It should avoid unnecessary agglomeration of data
3. It should be problem-oriented
4. It should employ functional and operational terms (episodes of illness, treatment regimens, lab tests)
5. It should express information briefly and imaginatively (tables, charts, percentages)
6. It should make provision for feedback of data

1. Demography and vital events
2. Environmental health statistics
3. Health status - mortality, morbidity, disability, quality of life
4. Health resources - facilities, beds, manpower
5. Utilization and non-utilization of health services
6. Indices of outcome of medical care
7. Financial statistics

1. Measure health status and quantify health problems
2. Local, national, and international comparisons (requires standardization)
3. Planning, administration, and management of health services
4. Assessing whether services accomplish their objectives (effectiveness & efficiency)
5. Assessing beneficiary satisfaction with the health system
6. Research into particular problems of health and disease

• Census
• Civil Registration System (vital events registration)
• Sample Registration System (SRS)
• National Family Health Survey (NFHS)
• Hospital records, disease notification, surveys

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2. Biostatistics - Measures of Central Tendency

MEAN (Arithmetic Mean)

• The sum of all observations divided by the number of observations
• Formula: x̄ = Σx / n
• Advantages: Uses all data values; mathematically tractable; most widely used
• Disadvantages: Affected by extreme values (outliers); may not represent skewed data well

MEDIAN

• The middle value when observations are arranged in order of magnitude
• For odd n: middle item; for even n: average of the two middle items
• Example: 5, 5, 5, 7, 10, 20, 102 - Mean = 22, Median = 7. The median is more representative here because the extreme value (102) does not distort it.
• Advantages: Not affected by extreme items; better for skewed data
• Disadvantages: Does not use all values; less mathematically useful

MODE

• The most frequently occurring value in a series
• Example: Diastolic BP of 20 individuals - if 75 appears most often, mode = 75
• Advantages: Easy to understand; not affected by extreme items
• Disadvantages: Exact location often uncertain; not well-defined; rarely used in biological/medical statistics

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3. Measures of Dispersion

(a) Range

• Difference between highest and lowest values in a sample
• Example: BP values 71, 75, 77, 79, 81, 83, 90, 94, 95 - Range = 95 - 71 = 24
• Simple but unstable; ignores all intermediate values

(b) Mean Deviation

• Average of the absolute deviations from the mean
• Rarely used in medical statistics

(c) Standard Deviation (SD)

• The most commonly used measure of dispersion
• Formula: σ = √[Σ(x - x̄)² / n]
• Represents the "root mean square deviation"
• Properties:
  • In a normal distribution: Mean ± 1 SD covers 68.27% of observations
  • Mean ± 2 SD covers 95.45% of observations
  • Mean ± 3 SD covers 99.73% of observations
• Advantages: Uses all observations; mathematically tractable; basis for inferential statistics
• Disadvantages: Affected by extreme values

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SHORT NOTES

Standard Deviation (SD)

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Standard Error (SE)

• The SE of a mean = SD / √n
• Measures the precision of the sample mean as an estimate of the population mean
• SE decreases as sample size increases
• SE of a proportion: SE = √(p × q / n), where p = proportion, q = 1 - p
• 95% confidence limits: x̄ ± 2 SE
• If the observed difference exceeds 2 SE, it is considered statistically significant

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Sampling

1. Simple Random Sample (SRS): Each unit is assigned a number; a random number table selects units. Every unit has an equal chance of selection. Maximum possible samples but requires a complete sampling frame.
2. Systematic Random Sample: Every nth unit is selected (e.g., every 10th house). First unit chosen randomly between 1 and n. Easy and practical.
3. Stratified Random Sample: Population divided into strata (age, religion, etc.); random sample drawn from each stratum. Useful when analyzing subgroups.

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Random Sampling

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Cluster Sampling

• Population is divided into clusters (naturally occurring groups like villages, districts)
• Clusters are randomly selected and all individuals within selected clusters are studied
• Used in large geographic areas where a sampling frame is unavailable
• Less expensive than SRS but may have higher sampling error
• Example: EPI (Expanded Programme on Immunization) coverage surveys use 30-cluster sampling

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Chi-Square (χ²) Test

• O = observed frequency
• E = expected frequency

1. Set up a contingency table (2×2 or larger)
2. Calculate expected values: E = (Row total × Column total) / Grand total
3. Calculate χ² = Σ(O - E)² / E
4. Find degrees of freedom: df = (r - 1)(c - 1)
5. Compare calculated χ² with critical value from table at p = 0.05
6. If calculated χ² > critical value → reject null hypothesis → significant association

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Census

• Defined by the United Nations as "the total process of collecting, compiling, and publishing demographic, economic and social data pertaining at a specified time to all persons in a country or delimited territory"
• Taken every 10 years in India; first regular census in 1881
• Last census held in March 2011; legal basis from the Census Act of 1948
• Provides age/sex breakdown needed to compute vital rates and health indicators
• Drawback: Results not quickly available; expensive and time-consuming

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Civil Registration System

• The continuous registration of vital events: births, deaths, marriages, divorces, adoptions
• UN definition: includes "legal registration, statistical recording and reporting of the occurrence of, and collection, compilation, presentation, analysis and distribution of statistics pertaining to vital events"
• India's system operates under the Registration of Births and Deaths Act, 1969
• Strengths: Continuous data; legal recognition of events
• Weaknesses in India: Incomplete registration, especially in rural areas; underregistration of deaths

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SRS (Sample Registration System)

• Established in India in 1964-65 as a large-scale demographic survey
• Provides reliable annual estimates of fertility (birth rate, total fertility rate) and mortality (death rate, infant mortality rate) at national and state levels
• Uses dual record system: continuous enumeration by a resident enumerator + independent six-monthly retrospective surveys by supervisors
• Most reliable source of birth and death rates in India

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NFHS-5 (National Family Health Survey - 5)

• Conducted in 2019-21 by the International Institute for Population Sciences (IIPS), Mumbai
• Covers all 36 states and UTs for the first time
• Key findings:
  • Total Fertility Rate (TFR): 2.0 nationally (below replacement level of 2.1)
  • Sex ratio at birth improved: 929 females per 1000 males
  • Institutional deliveries increased to 89%
  • Infant Mortality Rate (IMR): 35.2 per 1000 live births
  • Full immunization (12-23 months): 76.4%
  • Stunting in children under 5: 35.5%
  • Wasting: 19.3%
  • Anaemia in women (15-49 years): 57%

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Histogram

• A graphical representation of the frequency distribution of a continuous variable
• Rectangles/bars are drawn adjacent to each other (no gaps) - this distinguishes histogram from bar diagram
• X-axis: class intervals; Y-axis: frequency (or frequency density)
• Area of each bar represents frequency
• Used for: age distribution, height/weight distribution

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Bar Diagram

• Bars represent categorical or discrete data
• Bars are separated by spaces (unlike histogram)
• Types:
  • Simple bar chart: One variable, vertical or horizontal bars
  • Multiple (compound) bar chart: Two or more bars grouped together for comparison
  • Component (subdivided) bar chart: Bars divided into parts showing sub-categories
  • Proportional bar chart: All bars equal height (100%), showing proportions

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Type I and Type II Errors

• Type I Error (α - false positive): Rejecting a true null hypothesis. Concluding there IS a difference when none exists. The significance level (p < 0.05) is the accepted probability of committing a Type I error.
• Type II Error (β - false negative): Accepting a false null hypothesis. Concluding there is NO difference when one actually exists.
• Power of a test = 1 - β = ability to detect a true difference
• Reducing α increases β and vice versa; larger sample size reduces both

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CHAPTER 21: HEALTH EDUCATION

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LONG QUESTION: Health Education - Principles, Methods and Approaches

Definitions

1. Health education is "the translation of what is known about health, into desirable individual and community behaviour patterns by means of an educational process."
2. John Last: "The process by which individuals and groups learn to behave in a manner conducive to the promotion, maintenance or restoration of health."
3. Post Alma-Ata (1978): "A process aimed at encouraging people to want to be healthy, to know how to stay healthy, to do what they can individually and collectively to maintain health, and to seek help when needed."

Principles of Health Education

1. Credibility - information must be believable
2. Interest - must be relevant to felt needs
3. Participation - community must be actively involved
4. Motivation - address why people should change
5. Comprehension - simple, understandable message
6. Reinforcement - repeated messages to sustain change
7. Known to unknown - build on existing knowledge
8. Good human relations - non-judgmental approach
9. Setting and methodology - suited to audience
10. Feedback - two-way communication

Approaches/Models

1. Information Model: Simply providing health information; assumes knowledge leads to behaviour change. Limited effectiveness alone.
2. Motivation/Adoption Model (KAP): Knowledge → Attitude → Practice. Stages: Awareness → Interest → Evaluation → Trial → Adoption. Interpersonal communication is vital at the decision stage.
3. Social Intervention Model: Recognizes that the social environment must change, not just the individual. Group support and community involvement are emphasized.

Methods of Health Education

• Health counselling
• Home visits
• Bedside teaching

• Lectures
• Group discussions
• Focus Group Discussion (FGD)
• Symposium
• Workshop
• Demonstration
• Role play

• Radio, television, film
• Posters, pamphlets, leaflets
• Newspapers, magazines
• Drama, puppet shows
• Social media

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SHORT NOTES (Chapter 21)

Communication

• The process of transmitting information, ideas, attitudes, and feelings from one person to another
• Functions: to inform, to educate, to motivate, to counsel, to raise morale, to promote health development
• Elements: Sender → Message → Channel → Receiver → Feedback
• Effective communication depends on: credibility of source, content, clarity of message, context, continuity, channels used, and capability of audience

Types of Communication

1. Verbal: Spoken word - face to face, telephone, radio, television
2. Non-verbal: Body language, gestures, facial expressions, eye contact, appearance
3. Written: Letters, posters, pamphlets, books, newspapers
4. Formal vs. Informal: Formal channels (official) vs. informal (grapevine)
5. Vertical vs. Horizontal: Vertical (downward/upward through hierarchy) vs. horizontal (between equals)
6. One-way vs. Two-way: Broadcasting vs. dialogue

Barriers to Communication

1. Physical barriers: Distance, noise, poor infrastructure
2. Psychological barriers: Prejudice, fear, distrust, lack of interest
3. Language barriers: Technical jargon, dialect differences, literacy
4. Cultural barriers: Beliefs, customs, taboos, superstitions
5. Administrative barriers: Rigid hierarchy, poor organizational structure
6. Semantic barriers: Different interpretations of same words

Focus Group Discussion (FGD)

• A small group of 6-12 people brought together to discuss a specific topic guided by a moderator
• Used in formative research to understand community attitudes, beliefs, perceptions
• Advantages: group interaction generates rich qualitative data; fast and cost-effective
• Limitations: not representative; moderator bias; group conformity ("groupthink")

Symposium

• A formal group method where 3-5 experts each give a short prepared talk (10-15 minutes) on different aspects of the same topic, followed by audience discussion
• A chairperson coordinates and summarizes
• Useful for presenting multiple perspectives on a controversial topic

Workshop

• An intensive small group learning activity with active participation
• Combines lectures, discussions, demonstrations, and practice
• Participants work on specific problems and produce outputs
• More interactive and skill-building than a lecture

GATHER (Counselling Guide)

• A systematic approach to counselling in reproductive health/family planning:
  • G - Greet the client warmly
  • A - Ask about needs, concerns, and medical history
  • T - Tell relevant information about options
  • H - Help the client choose an appropriate method
  • E - Explain how to use the chosen method
  • R - Return - schedule a follow-up visit

BCC (Behaviour Change Communication)

• A strategic communication process that helps individuals, families, and communities to adopt and sustain positive and healthy behaviours
• Goes beyond information to address attitudes, social norms, and self-efficacy
• Uses formative research to understand target audience
• Channels: interpersonal, community, mass media
• Part of SBCC (Social Behaviour Change Communication) in modern public health

Health Education vs. Propaganda

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CHAPTER 22: HEALTH PLANNING & MANAGEMENT

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SHORT NOTES

Planning Cycle

1. Situation analysis - assess current health status, resources, problems
2. Priority setting - determine which problems to address first
3. Formulation of objectives - specific, measurable, time-bound
4. Identification of strategies - how to achieve objectives
5. Resource allocation - assign money, manpower, materials
6. Implementation - execute the plan
7. Monitoring - track progress during implementation
8. Evaluation - assess whether objectives were achieved
9. Feedback - review and revise for next cycle

PERT (Programme Evaluation and Review Technique)

• A management technique for detailed planning and supervision of complex projects
• Arrow Diagram: Represents the logical sequence in which events (nodes) and activities (arrows) must occur
• Identifies the critical path - activities that cannot be delayed without delaying the whole project
• Calculates three time estimates: optimistic, most likely, and pessimistic
• Benefits:
  • Aids in planning, scheduling, and monitoring
  • Improves communication between management levels
  • Identifies potential problem areas
  • Provides continuous progress reports

CPM (Critical Path Method)

• The critical path = the longest path through the network diagram
• Any delay in a critical path activity delays the entire project
• Similar to PERT but uses single time estimates; better suited for repetitive activities
• Non-critical activities have "float" time - they can be delayed without affecting the overall timeline
• Both PERT and CPM are types of Network Analysis

Cost-Benefit Analysis (CBA)

• All costs and all benefits (including indirect and intangible) are expressed in monetary terms
• Compares the total economic benefit vs. the total economic cost of a programme
• Result expressed as Benefit-Cost Ratio (BCR): BCR > 1 indicates the programme is worthwhile
• Used for comparing programmes with different objectives
• Limitation: difficult to monetize human life or suffering

Cost-Effectiveness Analysis (CEA)

• Compares the cost per unit of health outcome (e.g., cost per life saved, cost per DALY averted, cost per case prevented)
• Benefit is measured in natural/clinical units, NOT monetary terms
• Used to compare different interventions with the same goal
• More practical in health care than CBA
• Example: Comparing cost per child immunized by mobile vs. fixed-site vaccination

Bhore Committee (1946)

• Formally: Health Survey and Development Committee
• Chairman: Sir Joseph Bhore
• Key recommendations:
  • Three-tier health services (Primary → Secondary → Tertiary)
  • Short-term plan: Primary Health Unit for every 40,000 population
  • Long-term plan: Primary Health Centre for every 10,000-20,000 population
  • Integration of preventive and curative services
  • Social medicine orientation for medical education
  • "No individual should fail to secure adequate medical care due to inability to pay"
  • District hospital with 2500 beds
  • Barefoot doctor concept (PHC-based multipurpose worker)

Chadha Committee (1963)

• Formally: Health Survey and Planning Committee
• Chairman: M.S. Chadha
• Reviewed implementation of Bhore Committee recommendations
• Recommended that the PHC serve a population of 40,000
• Multipurpose workers at peripheral level
• Emphasized malaria eradication programme needs
• Recommended integration of various vertical programmes

Jungalwalla Committee (1967)

• Formally: Committee on Integration of Health Services
• Chairman: N. Jungalwalla
• Recommended integration of curative and preventive services
• Recommended multipurpose workers replacing single-purpose workers
• All health workers below PHC level should be multipurpose
• Led to the concept of the Multi-Purpose Health Worker (MPHW) scheme

NITI Aayog

• National Institution for Transforming India, established January 1, 2015
• Replaced the Planning Commission (est. 1950)
• Unlike Planning Commission, NITI Aayog is an advisory body - does NOT allocate funds to states
• Functions:
  • Policy think tank for the Government of India
  • Provides strategic and technical advice
  • Promotes cooperative federalism (bottom-up policy making)
  • Monitors and evaluates implementation of programmes
  • Develops 15-year vision, 7-year strategy, and 3-year action agenda
• Chairperson: Prime Minister of India
• Vice-Chairperson and CEO appointed by the PM

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CHAPTER 23: INTERNATIONAL HEALTH

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SHORT NOTES

WHO (World Health Organization)

1. Directing and coordinating authority on international health work
2. Technical assistance to governments on request
3. Establishing international standards for biological and pharmaceutical substances
4. Promoting health research and disseminating results
5. Providing information - publishing WHO Technical Reports, Bulletin of WHO, World Health Statistics
6. Control of communicable diseases - epidemiological surveillance, promoting disease eradication
7. Environmental health - safe water, sanitation, food safety standards
8. Maternal and child health - MCH programmes
9. Mental health programmes
10. Health manpower development - training, education
11. Nutrition - setting standards, combating malnutrition
12. Monitoring of drugs - essential medicines list
13. International Health Regulations (IHR) - preventing global spread of disease
14. Standardization of diagnostic procedures and nomenclature (ICD)
15. Collection and dissemination of health statistics globally

• World Health Assembly (WHA): Supreme governing body; meets annually in Geneva; all member states represented
• Executive Board: 34 technically qualified members; meets twice yearly; implements WHA decisions
• Secretariat: Director General at HQ + 6 Regional Directors

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UNICEF (United Nations Children's Fund)

• Established 1946 by UN General Assembly; originally "UN International Children's Emergency Fund"
• Renamed 1953 but acronym retained; HQ at New York
• Regional office at Kathmandu, Nepal (covering South Central Asian Region)
• Governed by a 36-nation Executive Board
• Works in collaboration with WHO, UNDP, FAO, UNESCO

1. Child health: Vaccines, BCG support to India, immunization, safe water, sanitation
2. Child nutrition: Low-cost protein-rich foods, supplementary feeding, combating PEM
3. Education: Especially girl-child education
4. Emergency relief in natural disasters and conflicts
5. Primary health care for mothers and children

• GOBI: Growth monitoring, Oral rehydration therapy, Breast feeding, Immunization
• FFF: Female education, Family spacing, Food supplementation

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GOBI-FFF

• G - Growth monitoring (to detect malnutrition early)
• O - Oral Rehydration Therapy (for diarrhoeal disease)
• B - Breastfeeding promotion
• I - Immunization
• F - Female education
• F - Family spacing (birth spacing)
• F - Food supplementation

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FAO (Food and Agriculture Organization)

• A specialized agency of the UN, HQ at Rome, Italy
• Established 1945
• Functions:
  • Raise levels of nutrition and standards of living
  • Improve production and distribution of food and agricultural products
  • Combat hunger and malnutrition worldwide
  • Collects and disseminates food and nutrition data (Food Balance Sheets)
  • Sets food safety standards (Codex Alimentarius - jointly with WHO)

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ILO (International Labour Organization)

• A specialized UN agency; HQ at Geneva, Switzerland
• Promotes rights at work, decent employment, social protection
• Sets international labour standards (Conventions and Recommendations)
• Relevant to health: occupational health and safety standards

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World Bank

• Provides loans and grants to developing countries
• Relevant to health through financing health systems, disease control programmes
• Publishes World Development Reports (influential 1993 report: "Investing in Health" introduced DALYs)
• Funds health infrastructure, essential medicines, nutrition programmes

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CARE (Cooperative for Assistance and Relief Everywhere)

• An international humanitarian organization
• Founded 1945 originally to send CARE packages to post-war Europe
• Focuses on: poverty eradication, women's empowerment, emergency relief, maternal and child health, water and sanitation

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USAID (United States Agency for International Development)

• The US government's principal agency for administering civilian foreign aid
• Funds health programmes: family planning, HIV/AIDS (PEPFAR), malaria, tuberculosis, immunization, nutrition
• Partners with governments and NGOs in developing countries

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International Health Regulations (IHR)

• Legal framework of WHO governing the international spread of disease
• IHR 2005 (revised, in force 2007): Replaced the 1969 IHR
• Covers "public health emergencies of international concern (PHEIC)"
• Three notifiable diseases under original IHR: Cholera, Plague, Yellow Fever (now replaced by an all-hazard approach)
• Requires countries to develop core capacities for surveillance and response
• Countries must notify WHO of events that may constitute a PHEIC
• Examples of PHEICs declared: H1N1 (2009), Ebola (2014), Zika (2016), COVID-19 (2020)

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International Red Cross / ICRC

• Founded 1863 by Henri Dunant (Swiss) after the Battle of Solferino
• Components of the Red Cross/Red Crescent Movement:
  1. International Committee of the Red Cross (ICRC) - Geneva
  2. International Federation of Red Cross and Red Crescent Societies (IFRC) - Geneva
  3. National Red Cross/Red Crescent Societies (India: Indian Red Cross Society, est. 1920)
• Functions: Protection of war victims, disaster relief, blood transfusion services, first aid training, tracing missing persons

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Voluntary Health Agencies

• Non-governmental organizations that supplement government health services
• Examples in India:
  • Indian Red Cross Society
  • Tuberculosis Association of India
  • Indian Council for Child Welfare
  • Family Planning Association of India
  • Leprosy Mission
  • Helpage India
• Functions: Fill gaps in government services; health education; research; training; advocacy; provide services to underserved populations

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• Expand any specific topic in more detail
• Add diagrams or images for concepts like histogram, bar chart, normal distribution
• Cover more subtopics from any chapter
• Format it differently - e.g., as short exam answers, bullet points, or tables
• Move on to other chapters in Park's textbook