Evidence-Based Medicine Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Evidence-Based Medicine. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Evidence-Based Medicine Indian Medical PG Question 1: Calculate the sensitivity of a screening test: True Positives=80, False Negatives=20, True Negatives=90, False Positives=10
- A. 90%
- B. 85%
- C. 80% (Correct Answer)
- D. 95%
Evidence-Based Medicine Explanation: ***80%***
- Sensitivity is calculated as **True Positives / (True Positives + False Negatives)**. In this case, 80 / (80 + 20) = 80/100, which equals 0.8 or 80%.
- This metric represents the proportion of **actual positive cases** that are correctly identified by the test.
*90%*
- This value might represent the **specificity** (True Negatives / (True Negatives + False Positives)) if calculated with the given numbers (90 / (90 + 10) = 90%).
- However, the question specifically asks for **sensitivity**, which is a different measure.
*85%*
- This percentage would be obtained if the total number of true positives and false negatives was 94 (e.g., 80 / 94), which is not the case here.
- It does not correspond to the correct formula for **sensitivity** using the provided data.
*95%*
- This result would occur if the test correctly identified 95 out of 100 actual positive cases (e.g., 95 TP and 5 FN).
- The given data of **80 True Positives** and **20 False Negatives** leads to a lower sensitivity.
Evidence-Based Medicine Indian Medical PG Question 2: Specificity of a diagnostic test is defined as:
- A. 0.95 (Correct Answer)
- B. 0.05
- C. 0.4
- D. 0.8
Evidence-Based Medicine Explanation: ***0.95***
- **Specificity** is the proportion of individuals without disease who test negative, calculated as **TN/(TN+FP)**.
- A specificity of 0.95 (95%) indicates an excellent test that correctly identifies 95% of healthy individuals as negative.
*0.05*
- This value represents the **false positive rate** (1 - specificity), not specificity itself.
- A specificity of 0.05 would mean only 5% of healthy individuals test negative, indicating a very poor test.
*0.4*
- This value is too low for specificity and could represent other test parameters like **positive predictive value**.
- A specificity of 0.4 would incorrectly classify 60% of healthy individuals as positive, making the test clinically unreliable.
*0.8*
- This value typically represents **sensitivity**, which is the proportion of diseased individuals who test positive.
- **Sensitivity** is calculated as **TP/(TP+FN)**, which is different from specificity that focuses on healthy individuals.
Evidence-Based Medicine Indian Medical PG Question 3: Which of the following is a type of observational study that analyzes population-level data?
- A. Ecological study (Correct Answer)
- B. Case-control study
- C. Randomized controlled trial
- D. Longitudinal study
Evidence-Based Medicine Explanation: ***Ecological study***
- This type of study examines the relationship between an exposure and an outcome at the **population level** rather than the individual level.
- It often uses aggregated data, such as incidence rates of disease in different geographic areas, to identify associations.
*Case-control study*
- This is an **individual-level observational study** that compares individuals with a disease (cases) to individuals without the disease (controls) and looks back retrospectively at their exposures.
- It is used to investigate potential risk factors for a disease but does not analyze population-level data directly.
*Randomized controlled trial*
- This is an **experimental study design** where participants are randomly assigned to an intervention group or a control group.
- It is considered the gold standard for establishing causality but does not analyze observational population-level data.
*Longitudinal study*
- This is an **individual-level observational study** that follows the same group of individuals over a period of time, collecting data at multiple points.
- While it observes changes over time, it typically focuses on individual-level trends and outcomes, not aggregated population data.
Evidence-Based Medicine Indian Medical PG Question 4: Which of the following statements about screening for disease is false?
- A. Time consuming
- B. Arbitrary and final (Correct Answer)
- C. Rarely a basis for starting treatment without further confirmation
- D. Done on apparently healthy people
Evidence-Based Medicine Explanation: ***Arbitrary and final*** ✓ **FALSE Statement - Correct Answer**
- Screening tests are **NOT arbitrary** - they use **established diagnostic criteria**, validated cutoff points, and standardized protocols
- Screening is **NOT final** - positive screening results always require **confirmatory diagnostic tests** before treatment decisions
- This statement is false because screening follows **evidence-based protocols** and serves as a **preliminary step** in disease detection, not a definitive diagnosis
*Time consuming* - TRUE Statement
- Mass screening programs are indeed **time-consuming** due to large population coverage, scheduling logistics, and follow-up requirements
- The process includes **participant recruitment**, **test administration**, **result notification**, and **tracking** of screen-positive individuals
*Rarely a basis for starting treatment without further confirmation* - TRUE Statement
- Screening tests are designed to **identify high-risk individuals** who require further evaluation, not to make treatment decisions
- **Confirmatory diagnostic tests** with higher specificity are required before initiating treatment
- Starting treatment based solely on screening results risks **overdiagnosis** and **unnecessary interventions** in false-positive cases
*Done on apparently healthy people* - TRUE Statement
- Screening specifically targets **asymptomatic populations** to detect disease in **preclinical stages**
- The goal is **early detection** before symptoms appear, when intervention may be most effective
- Distinguishes screening from diagnostic testing, which is performed on symptomatic individuals
Evidence-Based Medicine Indian Medical PG Question 5: Match the following columns on Epidemiology Guidelines:
| A. CARE | 1. RCT |
| :-- | :-- |
| B. CONSORT | 2. Case report |
| C. PRISMA | 3. Observational study |
| D. STROBE/MOOSE | 4. Systematic Review |
- A. A2-B1-C4-D3 (Correct Answer)
- B. A2-B4-C1-D3
- C. A4-B1-C3-D2
- D. A4-B1-C2-D3
Evidence-Based Medicine Explanation: ***A2-B1-C4-D3***
- **CARE Guidelines** provide essential reporting standards for **case reports** and case series to enhance their value and transparency.
- **CONSORT (Consolidated Standards of Reporting Trials)** is specifically designed for the reporting of **Randomized Controlled Trials (RCTs)**.
- **PRISMA (Preferred Reporting Items for Systematic reviews and Meta-Analyses)** provides a minimum set of items for reporting in **systematic reviews** and meta-analyses.
- **STROBE (STrengthening the Reporting of OBservational studies in Epidemiology)** and **MOOSE (Meta-analysis Of Observational Studies in Epidemiology)** are reporting guidelines for **observational studies**, including cohort, case-control, and cross-sectional studies.
*A2-B4-C1-D3*
- Incorrectly pairs CONSORT with systematic reviews (should be RCTs) and PRISMA with RCTs (should be systematic reviews).
- CONSORT is the gold standard for **reporting RCTs**, while PRISMA is designed for **systematic reviews and meta-analyses**.
*A4-B1-C3-D2*
- Incorrectly matches CARE with systematic reviews, PRISMA with observational studies, and STROBE/MOOSE with case reports.
- CARE is specifically for **case reports and case series**, PRISMA for **systematic reviews**, and STROBE/MOOSE for **observational epidemiological studies**.
*A4-B1-C2-D3*
- Incorrectly pairs CARE with systematic reviews and PRISMA with case reports.
- This reverses the actual purpose: CARE is designed for **case reports**, while PRISMA guides **systematic reviews and meta-analyses**.
Evidence-Based Medicine Indian Medical PG Question 6: A study is to be conducted to compare the fat content in the expressed breast milk of pre-term infants with that of term infants. Which study design is best suited?
- A. Longitudinal study
- B. Ambispective
- C. Case control
- D. Prospective cohort (Correct Answer)
Evidence-Based Medicine Explanation: ***Prospective cohort***
- Among the given options, a **prospective cohort study** is the most appropriate design for this comparative study.
- The study involves identifying two groups (mothers of pre-term vs. term infants) and **prospectively collecting breast milk samples** to measure and compare fat content between these groups.
- This design allows for **standardized data collection** moving forward in time, ensuring consistent measurement protocols for both groups.
- While this is essentially a comparative cross-sectional measurement, the prospective nature ensures proper sample collection and reduces recall bias.
*Case control*
- This design is used to compare **exposures** between those with and without an outcome (typically a disease).
- Fat content in breast milk is a **continuous biological variable**, not a disease outcome, making case-control design inappropriate.
- Case-control studies work backward from outcome to exposure, which doesn't fit this scenario where we're comparing groups defined by infant term status.
*Longitudinal study*
- While **prospective cohort** is a type of longitudinal study, this term is too broad and non-specific.
- Longitudinal studies involve repeated measurements over time, but this question asks for a specific study design for comparing two groups.
- Simply stating "longitudinal study" doesn't specify the comparative framework needed.
*Ambispective*
- An **ambispective (or ambi-directional) study** combines retrospective and prospective components, using existing historical data plus new follow-up.
- This design is unnecessary here as there's no indication of existing historical data to utilize.
- The study can be conducted entirely prospectively by identifying mothers and collecting fresh breast milk samples for analysis.
Evidence-Based Medicine Indian Medical PG Question 7: What type of evidence do medical certificates provide?
- A. Testimonial evidence
- B. Indirect evidence
- C. Conditional release documentation
- D. Documentary evidence of a patient's condition (Correct Answer)
Evidence-Based Medicine Explanation: ***Documentary evidence of a patient's condition***
- Medical certificates are formal written documents prepared by a healthcare professional that provide **objective information** regarding a patient's medical status, diagnosis, treatment, and fitness for work or other activities.
- Under the **Indian Evidence Act, 1872 (Section 3)**, medical certificates are classified as **documentary evidence** - they serve as verifiable written records offering **factual proof** of a patient's health situation at a specific time.
- They are considered **direct evidence** that can be produced in court to establish medical facts.
*Testimonial evidence*
- This involves **oral statements** made under oath, typically in a court of law, by a witness who has direct knowledge of the facts.
- While a doctor might provide testimonial evidence when called as a witness, the certificate itself is not a spoken testimony but a **written document**.
*Indirect evidence*
- Also known as **circumstantial evidence**, this refers to facts that, when proven, suggest the existence of another fact without directly proving it.
- Medical certificates directly state the patient's condition, making them **direct documentary evidence**, not indirect or circumstantial evidence.
*Conditional release documentation*
- This type of document pertains to the **release of a patient from a hospital** or facility under certain conditions, such as follow-up appointments or medication adherence.
- While a medical certificate might be part of a discharge process, its primary legal classification is as **documentary evidence**, not a specific type of release documentation.
Evidence-Based Medicine Indian Medical PG Question 8: Which test is used for detecting gunshot residue?
- A. Lie test for Firearm injury
- B. Neutron activation analysis for firearm use (Correct Answer)
- C. Toluidine blue test
- D. Benzidine test for blood stain
Evidence-Based Medicine Explanation: ***Neutron activation analysis for firearm use***
- **Neutron activation analysis (NAA)** is a highly sensitive and reliable method for detecting specific elements characteristic of **gunshot residue (GSR)**, such as **barium**, **antimony**, and **lead**.
- This technique works by irradiating samples with neutrons, causing them to emit gamma rays that are unique to each element, allowing for precise identification and quantification of GSR particles.
*Lie test for Firearm injury*
- A "lie test" typically refers to a **polygraph test**, which assesses physiological responses to detect deception, not physical evidence like gunshot residue.
- Polygraph tests are not used for identifying **firearm injury** or the presence of actual physical traces.
*Toluidine blue test*
- The **Toluidine blue test** is primarily used in dentistry to detect and delineate **dysplastic or malignant lesions** in the oral mucosa.
- It has no application in the forensic analysis of gunshot residue or firearm use.
*Benzidine test for blood stain*
- The **Benzidine test** was historically used as a preliminary test for the presence of **blood stains**, as it reacts with the heme component of hemoglobin.
- It is not used for detecting **gunshot residue** and has largely been replaced by safer and more specific tests due to its carcinogenic properties.
Evidence-Based Medicine Indian Medical PG Question 9: Which of the following is not a characteristic of a systematic review?
- A. Search for literature is compulsory using explicit search strategy
- B. Critical appraisal is always criteria based
- C. Meta analysis is always performed (Correct Answer)
- D. Research questions always focused
Evidence-Based Medicine Explanation: ***Meta-analysis is always performed***
- While **meta-analysis** is frequently a component of a systematic review, it is not always performed; it is only feasible when the included studies are sufficiently homogeneous and quantitative synthesis is appropriate.
- A systematic review can identify, appraise, and synthesize evidence without statistically combining results, especially when studies are too **heterogeneous**.
*Search for literature is compulsory using explicit search strategy*
- A **comprehensive and explicit search strategy** is a defining characteristic of a systematic review, ensuring all relevant literature is included and bias is minimized.
- This systematic approach helps to identify all studies on a given topic, regardless of their outcome.
*Research questions always focused*
- Systematic reviews are driven by **clearly defined and focused research questions** (often in PICO format: Population, Intervention, Comparison, Outcome) to guide the search, selection, and analysis processes.
- A focused question ensures the review has a narrow scope, allowing for a thorough and relevant synthesis of the evidence.
*Critical appraisal is always criteria-based*
- **Critical appraisal** using predefined criteria (e.g., risk of bias tools) is a mandatory step in a systematic review to evaluate the methodological quality and validity of the included studies.
- This systematic assessment helps to determine the strength of the evidence and its applicability.
Evidence-Based Medicine Indian Medical PG Question 10: In which type of study is selection bias most likely to occur?
- A. Cohort study
- B. Case-control study (Correct Answer)
- C. Cross-sectional study
- D. Randomized controlled trial (RCT)
Evidence-Based Medicine Explanation: ***Case-control study***
- **Selection bias** is a common concern as cases and controls are often selected based on their disease status, making it difficult to ensure they represent the underlying population's exposure distribution.
- This study design inherently involves **retrospective data collection**, increasing the risk of differential selection of participants based on their exposure history.
- The retrospective nature and non-random selection of cases and controls makes this study type **most vulnerable** to selection bias.
*Cohort study*
- While selection bias can occur (e.g., participants lost to follow-up), it is generally **less pronounced** than in case-control studies because subjects are selected based on **exposure status** before disease development, minimizing bias related to outcome.
- The prospective nature of many cohort studies reduces the risk of selecting participants based on a known outcome.
*Cross-sectional study*
- Selection bias can occur if the sample is not representative of the target population.
- However, since both exposure and outcome are measured **simultaneously**, there is no temporal selection based on outcome status as seen in case-control studies.
- The risk is lower than case-control studies as participants are typically selected from a defined population at one point in time.
*Randomized controlled trial (RCT)*
- **Randomization** is specifically designed to minimize selection bias by ensuring that exposure (intervention) assignment is independent of participant characteristics.
- The process of randomly assigning participants to treatment or control groups reduces the likelihood of systemic differences between groups at baseline.
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