Uses of screening in psm

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Uses of Screening in PSM

(Source: Park's Textbook of Preventive and Social Medicine)

Definition

Screening is the presumptive identification of unrecognized disease or defect by applying tests, examinations, or other procedures to apparently healthy individuals who are not seeking health care. The screening test itself does not establish a definitive diagnosis - it sorts out apparently well persons who probably have a disease from those who probably do not.

Four Main Uses of Screening

Park describes four main uses of screening:

1. Case Detection (Prescriptive Screening)

Also called "prescriptive screening"
Defined as the presumptive identification of unrecognized disease not arising from a patient's own request
People are screened primarily for their own benefit
Examples of diseases detected:
- Bacteriuria in pregnancy
- Breast cancer, cervical cancer
- Deafness in children
- Diabetes mellitus
- Iron deficiency anaemia
- Phenylketonuria (PKU)
- Pulmonary tuberculosis
- Haemolytic disease of the newborn
- Neonatal screening programmes
Since disease detection is initiated by medical/public health personnel, they carry a special obligation to ensure early treatment is started

2. Control of Disease (Prospective Screening)

Also known as "prospective screening"
People are examined for the benefit of others, not just themselves
Examples:
- Screening of immigrants for tuberculosis and syphilis to protect the home population
- Screening for streptococcal infection to prevent rheumatic fever
The programme leads to early diagnosis, permitting more effective treatment, and reducing spread of infectious disease and/or mortality

3. Research Purposes

Used when the natural history of a disease is not fully known (e.g., cancer, hypertension)
Initial screening provides a prevalence estimate; subsequent screening provides an incidence figure
Aids in obtaining more basic knowledge about the natural history of chronic diseases
Important ethical point: where screening is done for research purposes, the investigator must inform study participants that no follow-up therapy will be available

4. Qualification Screening

Carried out to assess suitability of individuals for a particular role or task
Examples: pre-employment medical examinations, fitness-for-service screening in armed forces, screening for blood donation

Types of Screening

Three types are described:

Type	Description	Example
Mass Screening	Screening of the whole population without selection	Population-wide BP screening
High-risk (Selective) Screening	Targeted at high-risk groups to increase yield	Diabetes screening in >40 years age group
Multiphasic Screening	Application of two or more screening tests in combination at one time	Health questionnaire + clinical exam + blood/urine tests + audiometry + lung function tests

Note on Multiphasic Screening: Evidence from randomized controlled studies in the UK and USA suggested it has not shown measurable benefit in terms of mortality/morbidity reduction, while increasing health service costs. Most tests used have also not been validated, casting doubts on its utility.

Distinction: Screening vs. Case-finding vs. Diagnostic Tests

Term	Definition	Example
Screening	Testing in populations NOT seeking health care	Serological testing for HIV in blood donors; neonatal screening
Case-finding	Using tests to detect disease in individuals seeking care for OTHER reasons	VDRL for syphilis in pregnant women; detecting hypertension in routine OPD
Diagnostic tests	Confirming/refuting disease in patients WITH signs and symptoms	VDRL in a patient with lesions suggestive of secondary syphilis

The same test (e.g., VDRL) can serve different purposes depending on context.

Criteria for a Good Screening Programme

Disease criteria:

Important health problem (high prevalence)
Recognizable latent or early asymptomatic stage
Natural history adequately understood
Effective treatment available
Facilities available for confirmation of diagnosis
Agreed-on policy on whom to treat
Good evidence that early detection reduces morbidity and mortality
Expected benefits exceed risks and costs

Test criteria (screening test must satisfy):

Acceptability - acceptable to the target population (painful/embarrassing tests reduce compliance)
Repeatability - consistent results on repeated application
Validity - high sensitivity and specificity
Yield - adequate amount of previously unrecognized disease identified
Simplicity, safety, rapidity, ease of administration, low cost

Yield of Screening

"Yield" is the amount of previously unrecognized disease that is diagnosed as a result of the screening effort. It depends on:

Sensitivity and specificity of the test
Prevalence of the disease in the population
Participation/cooperation of individuals

High-risk populations are usually selected for screening to increase yield. For example, limiting a diabetes screening programme to persons over 40 years increases the yield.

- Park's Textbook of Preventive and Social Medicine, Chapter on Epidemiology

Make a presentation summarizing screening types, uses, and criteria

Reading File

Running Command

ls /home/daytona/workspace/ 2>/dev/null && echo "---" && ls /home/daytona/skills…

Running Command

mkdir -p /home/daytona/workspace/screening-psm

Writing File

~/screening-psm/build.js

const pptxgen = require("pptxgenjs");

const pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title = "Screening in PSM";
pres.author = "Orris";

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// ── HELPERS ─────────────────────────────────────────────────────────────────
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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 1 — TITLE
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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 2 — OVERVIEW / AGENDA
// ════════════════════════════════════════════════════════════════════════════
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  const s = pres.addSlide();
  lightSlide(s);
  sectionHeader(s, "What We Will Cover");

  const topics = [
    ["01", "Screening vs. Case-finding vs. Diagnosis", "Key distinctions between three related concepts"],
    ["02", "Types of Screening", "Mass, Selective, and Multiphasic"],
    ["03", "Uses of Screening", "Four main purposes described by Park"],
    ["04", "Disease Criteria", "9 criteria for a disease to be suitable for screening"],
    ["05", "Test Criteria", "Properties a good screening test must have"],
    ["06", "Yield of Screening", "What determines how much unrecognized disease is detected"],
  ];

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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 3 — DISTINCTIONS
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  lightSlide(s);
  sectionHeader(s, "Screening  vs.  Case-finding  vs.  Diagnostic Tests");

  const cols = [
    {
      title: "SCREENING", color: C.navy, icon: "🔍",
      def: "Testing in populations NOT seeking health care",
      ex: ["Serological testing for HIV in blood donors", "Neonatal screening programmes", "Premarital syphilis screening"]
    },
    {
      title: "CASE-FINDING", color: C.teal, icon: "📋",
      def: "Detecting disease in individuals seeking care for OTHER reasons",
      ex: ["VDRL in pregnant women attending ANC", "BP check in routine OPD", "Cervical cancer in gynaecology patients"]
    },
    {
      title: "DIAGNOSTIC TEST", color: C.aqua, icon: "🧪",
      def: "Confirming/refuting disease in patients WITH signs & symptoms",
      ex: ["VDRL in patient with secondary syphilis lesions", "Endocervical culture for N. gonorrhoeae", "FBS in symptomatic patient"]
    },
  ];

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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 4 — TYPES OF SCREENING
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  lightSlide(s);
  sectionHeader(s, "Types of Screening");

  const types = [
    {
      num: "01", title: "MASS SCREENING", color: C.navy,
      desc: "Screening of the entire population without any selection criteria.",
      points: ["Applied to all members of a community", "High coverage but lower efficiency", "Example: Universal BP measurement in adults"],
      pros: "Maximum reach",
      cons: "High cost, lower yield"
    },
    {
      num: "02", title: "SELECTIVE (High-risk) SCREENING", color: C.teal,
      desc: "Targeted at specific high-risk groups to increase diagnostic yield.",
      points: ["Applied to sub-populations at elevated risk", "More cost-effective than mass screening", "Example: Diabetes screening in persons >40 yrs"],
      pros: "Higher yield, lower cost",
      cons: "Risk groups may be misidentified"
    },
    {
      num: "03", title: "MULTIPHASIC SCREENING", color: C.aqua,
      desc: "Two or more screening tests applied in combination to a large population at one time.",
      points: ["May include questionnaire, clinical exam, bloods, lung function, audiometry", "Historically popular in UK & USA", "RCTs showed NO benefit in mortality/morbidity"],
      pros: "Broad detection scope",
      cons: "Unvalidated tests; increased costs; no proven mortality benefit"
    },
  ];

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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 5 — USES OF SCREENING
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  lightSlide(s);
  sectionHeader(s, "Uses of Screening  —  Four Main Uses (Park)");

  // Left side: 4 use cards stacked
  const uses = [
    {
      num: "1", color: C.navy, title: "Case Detection (Prescriptive Screening)",
      body: "Presumptive identification of unrecognized disease not arising from a patient's request. People screened primarily for their own benefit.",
      ex: "Neonatal screening, PKU, bacteriuria in pregnancy, breast/cervical cancer"
    },
    {
      num: "2", color: C.teal, title: "Control of Disease (Prospective Screening)",
      body: "People are examined for the benefit of others — reduces spread of infectious disease.",
      ex: "Screening immigrants for TB/syphilis; streptococcal infection to prevent rheumatic fever"
    },
    {
      num: "3", color: "7B5EA7", title: "Research Purposes",
      body: "Used when natural history of a disease is not fully known. Initial screening = prevalence estimate; repeat screening = incidence figure.",
      ex: "Chronic disease research (cancer, hypertension). Note: participants must be informed if no follow-up therapy is planned."
    },
    {
      num: "4", color: C.aqua, title: "Qualification Screening",
      body: "Assessment of suitability for a particular role or task.",
      ex: "Pre-employment medicals, armed forces fitness screening, blood donor screening"
    },
  ];

  uses.forEach(({ num, color, title, body, ex }, i) => {
    const y = 0.82 + i * 1.15;
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      fill: { color: C.white },
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  });
}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 6 — DISEASE CRITERIA
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  lightSlide(s);
  sectionHeader(s, "Criteria for Screening — The Disease");

  s.addText("Before initiating a screening programme, the disease must satisfy ALL of the following:", {
    x: 0.35, y: 0.82, w: 9.3, h: 0.3, fontSize: 9.5, italic: true, color: C.subtext, margin: 0
  });

  const criteria = [
    ["1", "Important Health Problem", "Condition must be prevalent and significant in the community"],
    ["2", "Latent / Asymptomatic Stage", "A recognizable pre-symptomatic phase must exist"],
    ["3", "Natural History Understood", "Disease progression from latent to declared disease must be adequately known"],
    ["4", "Detectable by a Test", "A test must be able to detect disease before signs/symptoms appear"],
    ["5", "Diagnostic Facilities", "Facilities must be available to confirm the diagnosis"],
    ["6", "Effective Treatment", "An accepted and effective treatment must be available"],
    ["7", "Agreed Treatment Policy", "Clear consensus on who should be treated (e.g., borderline hypertension, diabetes)"],
    ["8", "Early Detection Reduces Mortality", "Good evidence that early detection + treatment reduces morbidity/mortality"],
    ["9", "Benefits > Risks + Costs", "Expected benefits (lives saved) must exceed the risks and financial costs"],
  ];

  const col1 = criteria.slice(0, 5);
  const col2 = criteria.slice(5);

  [col1, col2].forEach((col, ci) => {
    col.forEach(([num, title, desc], ri) => {
      const x = 0.3 + ci * 4.8;
      const y = 1.2 + ri * 0.83;
      s.addShape(pres.shapes.RECTANGLE, {
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        fill: { color: C.white },
        line: { color: C.slate, pt: 1 },
        shadow: { type: "outer", color: "000000", blur: 3, offset: 1, angle: 135, opacity: 0.08 }
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      // left accent
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    });
  });
}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 7 — TEST CRITERIA
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  lightSlide(s);
  sectionHeader(s, "Criteria for Screening — The Test");

  s.addText("A screening test must satisfy the following properties:", {
    x: 0.35, y: 0.82, w: 9.3, h: 0.3, fontSize: 9.5, italic: true, color: C.subtext, margin: 0
  });

  const testCriteria = [
    { icon: "✓", title: "Validity", color: C.navy, body: "High Sensitivity (few false negatives) + High Specificity (few false positives). Tests with greater accuracy are often more expensive." },
    { icon: "↻", title: "Repeatability", color: C.teal, body: "Consistent, reproducible results on repeated application under the same conditions." },
    { icon: "👥", title: "Acceptability", color: "7B5EA7", body: "Must be acceptable to the target population. Painful, embarrassing or discomforting tests (e.g., rectal/vaginal exams) reduce participation." },
    { icon: "⚡", title: "Simplicity & Rapidity", color: C.aqua, body: "Should be easy to administer and yield results quickly so large populations can be screened efficiently." },
    { icon: "🎯", title: "Yield", color: "2E7D32", body: "Amount of previously unrecognized disease detected. Depends on: sensitivity, specificity, disease prevalence, and participation rate." },
    { icon: "$", title: "Cost-effectiveness", color: "C62828", body: "Must be financially justifiable. Balance between test accuracy and economic cost." },
  ];

  const cols = 3;
  testCriteria.forEach(({ icon, title, color, body }, i) => {
    const col = i % cols;
    const row = Math.floor(i / cols);
    const x = 0.3 + col * 3.15;
    const y = 1.2 + row * 2.0;
    s.addShape(pres.shapes.RECTANGLE, {
      x, y, w: 3.0, h: 1.8,
      fill: { color: C.white },
      shadow: { type: "outer", color: "000000", blur: 5, offset: 2, angle: 135, opacity: 0.12 },
      line: { color: C.light, pt: 1 }
    });
    s.addShape(pres.shapes.RECTANGLE, { x, y, w: 3.0, h: 0.06, fill: { color }, line: { color } });
    s.addText(icon, { x, y: y + 0.1, w: 3.0, h: 0.42, fontSize: 18, align: "center", color, margin: 0 });
    s.addText(title, { x: x + 0.1, y: y + 0.52, w: 2.8, h: 0.32, fontSize: 11, bold: true, color, align: "center", margin: 0 });
    s.addShape(pres.shapes.RECTANGLE, { x: x + 0.6, y: y + 0.84, w: 1.8, h: 0.02, fill: { color: C.slate }, line: { color: C.slate } });
    s.addText(body, { x: x + 0.1, y: y + 0.9, w: 2.8, h: 0.8, fontSize: 8.5, color: C.text, margin: 0 });
  });
}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 8 — YIELD
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  lightSlide(s);
  sectionHeader(s, "Yield of Screening");

  // Definition box
  s.addShape(pres.shapes.RECTANGLE, {
    x: 0.3, y: 0.85, w: 9.4, h: 0.9,
    fill: { color: C.navy }, line: { color: C.navy }
  });
  s.addText([
    { text: "YIELD  ", options: { bold: true, fontSize: 13, color: C.aqua } },
    { text: "= Amount of previously unrecognized disease that is diagnosed as a result of the screening effort.", options: { fontSize: 12, color: C.white } }
  ], { x: 0.45, y: 0.85, w: 9.1, h: 0.9, valign: "middle", margin: 0.1 });

  // Determinants
  s.addText("Determinants of Yield", { x: 0.3, y: 1.9, w: 4.5, h: 0.35, fontSize: 12, bold: true, color: C.navy, margin: 0 });

  const factors = [
    ["Sensitivity of the Test", "Higher sensitivity → fewer missed cases → higher yield"],
    ["Specificity of the Test", "Higher specificity → fewer false positives → better targeting"],
    ["Prevalence of Disease", "Higher prevalence in screened group → more cases detected"],
    ["Participation Rate", "Greater public cooperation → more disease detected overall"],
  ];

  factors.forEach(([title, desc], i) => {
    const y = 2.32 + i * 0.72;
    s.addShape(pres.shapes.RECTANGLE, {
      x: 0.3, y, w: 4.6, h: 0.62,
      fill: { color: C.white },
      shadow: { type: "outer", color: "000000", blur: 3, offset: 1, angle: 135, opacity: 0.08 },
      line: { color: C.slate, pt: 1 }
    });
    s.addShape(pres.shapes.RECTANGLE, { x: 0.3, y, w: 0.12, h: 0.62, fill: { color: C.teal }, line: { color: C.teal } });
    s.addText(title, { x: 0.52, y: y + 0.04, w: 4.2, h: 0.26, fontSize: 9.5, bold: true, color: C.navy, margin: 0 });
    s.addText(desc, { x: 0.52, y: y + 0.3, w: 4.2, h: 0.26, fontSize: 8.5, color: C.subtext, margin: 0 });
  });

  // Right side: key insight
  s.addShape(pres.shapes.RECTANGLE, {
    x: 5.3, y: 1.9, w: 4.4, h: 3.5,
    fill: { color: C.slate }, line: { color: C.light, pt: 1 }
  });
  s.addText("Practical Application", { x: 5.45, y: 2.0, w: 4.1, h: 0.32, fontSize: 11, bold: true, color: C.navy, margin: 0 });
  s.addShape(pres.shapes.RECTANGLE, { x: 5.45, y: 2.35, w: 4.1, h: 0.02, fill: { color: C.light }, line: { color: C.light } });

  const insights = [
    "High-risk populations are usually selected for screening to increase yield.",
    "Example: Limiting a diabetes screening programme to persons OVER 40 years significantly increases yield.",
    "Restricting to high-prevalence sub-groups saves resources while maximizing detection.",
    "The goal is always to maximize previously unrecognized cases found per unit cost."
  ];
  const insightBullets = insights.map((t, i) => ({
    text: t,
    options: { bullet: true, breakLine: i < insights.length - 1, fontSize: 9, color: C.text }
  }));
  s.addText(insightBullets, { x: 5.45, y: 2.42, w: 4.1, h: 2.8, valign: "top", margin: 0 });
}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 9 — SUMMARY / CONCLUSION
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  darkSlide(s);

  s.addShape(pres.shapes.RECTANGLE, { x: 7.5, y: 0, w: 2.5, h: 5.625, fill: { color: C.teal }, line: { color: C.teal } });
  s.addShape(pres.shapes.RECTANGLE, { x: 7.15, y: 0, w: 0.4, h: 5.625, fill: { color: C.aqua }, line: { color: C.aqua } });

  s.addText("KEY TAKEAWAYS", { x: 0.4, y: 0.25, w: 6.6, h: 0.5, fontSize: 22, bold: true, color: C.aqua, charSpacing: 4, margin: 0 });
  s.addShape(pres.shapes.RECTANGLE, { x: 0.4, y: 0.8, w: 6.6, h: 0.04, fill: { color: C.teal }, line: { color: C.teal } });

  const takeaways = [
    ["3 TYPES", "Mass  |  Selective (High-risk)  |  Multiphasic"],
    ["4 USES", "Case Detection  |  Disease Control  |  Research  |  Qualification"],
    ["9 DISEASE CRITERIA", "Prevalence, latent stage, natural history, test available, facilities, treatment, policy, evidence of benefit, benefits > costs"],
    ["KEY TEST PROPERTIES", "Validity (sensitivity + specificity), Repeatability, Acceptability, Simplicity, Yield, Cost-effectiveness"],
    ["YIELD PRINCIPLE", "Select high-risk groups to maximize unrecognized disease detected per unit cost"],
  ];

  takeaways.forEach(([label, value], i) => {
    const y = 0.95 + i * 0.88;
    s.addShape(pres.shapes.RECTANGLE, { x: 0.4, y, w: 1.5, h: 0.72, fill: { color: C.teal }, line: { color: C.teal } });
    s.addText(label, { x: 0.4, y, w: 1.5, h: 0.72, fontSize: 8.5, bold: true, color: C.white, align: "center", valign: "middle", margin: 0.05 });
    s.addShape(pres.shapes.RECTANGLE, { x: 1.9, y, w: 5.1, h: 0.72, fill: { color: "163C66" }, line: { color: "163C66" } });
    s.addText(value, { x: 2.0, y, w: 4.9, h: 0.72, fontSize: 9.5, color: C.light, valign: "middle", margin: 0 });
  });

  s.addText("Park's Textbook of Preventive & Social Medicine", {
    x: 7.55, y: 4.8, w: 2.3, h: 0.3, fontSize: 7.5, italic: true, color: C.light, align: "center", margin: 0
  });
}

// ── WRITE FILE ───────────────────────────────────────────────────────────────
pres.writeFile({ fileName: "/home/daytona/workspace/screening-psm/Screening_in_PSM.pptx" })
  .then(() => console.log("Done: /home/daytona/workspace/screening-psm/Screening_in_PSM.pptx"))
  .catch(e => { console.error(e); process.exit(1); });

Running Command

cd /home/daytona/workspace/screening-psm && node build.js 2>&1

Your presentation is ready!

Screening in PSM

Presentation · PPTX

What's included across 9 slides:

Slide	Content
1	Title slide with definition of screening
2	Overview / agenda with 6 topic cards
3	Screening vs. Case-finding vs. Diagnostic Tests (3-column layout)
4	Three types of screening - Mass, Selective, Multiphasic (with pros/cons)
5	Four uses of screening with examples (horizontal card layout)
6	9 Disease criteria for screening (two-column grid)
7	6 Test criteria (icon cards)
8	Yield - definition, determinants, and practical application
9	Key Takeaways summary slide

Design: Navy/teal/aqua medical palette with dark title and summary slides, light content slides, shadow cards, and accent bars. All content is sourced from Park's Textbook of Preventive and Social Medicine.

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