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Related Concept Videos

Urologic Endoscopic Procedure: Cystoscopic Examination01:28

Urologic Endoscopic Procedure: Cystoscopic Examination

Meaning of Cystoscopic Examination:Cystoscopy is an essential diagnostic tool in urology that is used to assess the structure and function of the genitourinary system. It provides a direct view of the urethra, bladder, and, in some cases, the ureteral openings. This procedure helps detect structural abnormalities, infections, cancers, and blockages in the urinary tract. There are two types of cystoscopy:Flexible cystoscopy is commonly performed in outpatient settings due to its less invasive...
Urodynamic Studies: Uroflowmetry01:19

Urodynamic Studies: Uroflowmetry

Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
Urinary Tract Calculi VI: Surgical Management01:25

Urinary Tract Calculi VI: Surgical Management

Procedures for Kidney StonesMedical intervention is necessary when kidney stones or renal calculi are too large to pass spontaneously (typically greater than 5 millimeters) when stones are accompanied by symptomatic infection (such as fever or pyelonephritis), when they impair kidney function, or when they cause persistent symptoms like severe pain, nausea, or urinary retention. Additionally, patients with only one kidney or those who cannot be treated with medical management also require...
Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
Sample Size Calculation01:19

Sample Size Calculation

Knowledge of the sample size is the first requirement to conduct random sampling or an experiment. The sample size is the total number of units, observations, or groups (in some cases) used to get the data to estimate a population parameter. As the name suggests, the sample size is that of the sample drawn from the population and differs from the population size.
The sample size for the given experiment or sampling effort is fundamental to any study design. Sample size decides the number of...
Disorders of the Male Reproductive System01:20

Disorders of the Male Reproductive System

Men's health issues are increasingly recognized as significant, with several conditions posing common threats. Among these, testicular cancer is especially prevalent in younger men, particularly those aged 20 to 35 years. The disease often manifests as a painless mass in the testicles, sometimes accompanied by a sensation of heaviness or a dull ache.
Prostate disorders are another major concern. These conditions can impair urinary flow due to the prostate's location around the urethra. Symptoms...

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Optimizing Mouse Urodynamic Techniques for Improved Accuracy
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Published on: June 7, 2024

Sample size matters: A guide for urologists.

Peter Hinh1, Steven E Canfield

  • 1Division of Urology, University of Texas Medical School at Houston, Houston, Texas, USA.

Indian Journal of Urology : IJU : Journal of the Urological Society of India
|January 27, 2012
PubMed
Summary
This summary is machine-generated.

Calculating the correct sample size is crucial for effective clinical research and ethical study design. This guide explains essential statistical concepts for determining sample size, using urology examples.

Keywords:
Evidence-based practiceresearchstatistics

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Area of Science:

  • Biostatistics
  • Clinical Research Methodology
  • Urology Research

Background:

  • Accurate sample size determination is fundamental for the validity and ethical conduct of clinical research.
  • Inadequate sample sizes can lead to inconclusive results and wasted resources, while excessively large samples raise ethical concerns.
  • Understanding sample size principles is essential for researchers and for critically evaluating published literature.

Purpose of the Study:

  • To present fundamental statistical concepts and study design principles relevant to sample size calculation.
  • To highlight the importance of sample size in ethical research considerations.
  • To illustrate these concepts using practical scenarios within the field of urology.

Main Methods:

  • Review of basic statistical principles related to study design.
  • Explanation of tenets for calculating requisite sample size.
  • Application of concepts to urological research scenarios.

Main Results:

  • Provides a foundational understanding of sample size calculation.
  • Emphasizes the link between sample size, statistical power, and ethical research.
  • Offers practical examples for urology researchers.

Conclusions:

  • Proper sample size calculation is indispensable for robust clinical research and ethical practice.
  • The presented concepts and examples aid researchers in planning and appraising studies.
  • A clear understanding of sample size enhances the quality and integrity of research findings.