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Related Concept Videos

What is an Experiment?01:12

What is an Experiment?

An experiment is a planned activity carried out under controlled conditions. The purpose of an experiment is to investigate the relationship between two variables. When one variable causes change in another, we call the first variable the explanatory or independent variable. The affected variable is called the response or dependent variable. In a randomized experiment, the researcher manipulates values of the explanatory variable and measures the resulting changes in the response variable. The...
Data Collection by Experiments01:13

Data Collection by Experiments

Data collection is a systematic method of obtaining, observing, measuring, and analyzing accurate information. An experimental study is a standard method of data collection that involves the manipulation of the samples by applying some form of treatment prior to data collection. It refers to manipulating one variable to determine its changes on another variable. The sample subjected to treatment is known as “experimental units.”
An example of the experimental method is a public clinical trial...

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Related Experiment Video

Updated: Jun 19, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
07:52

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department

Published on: January 29, 2011

Emergency Department utilisation: a natural experiment.

Cecelia Rademeyer1, Peter A Jones, Stuart Dalziel

  • 1Department of Emergency Medicine, Auckland City Hospital, Auckland Mail Centre, Auckland, New Zealand.

The New Zealand Medical Journal
|October 17, 2009
PubMed
Summary
This summary is machine-generated.

The opening of Waitakere Hospital's new Emergency Department (ED) did not reduce attendances at other Auckland hospitals. Instead, it coincided with a significant increase in ED presentations within the Waitemata District Health Board area.

Related Experiment Videos

Last Updated: Jun 19, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
07:52

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department

Published on: January 29, 2011

Area of Science:

  • Health Services Research
  • Emergency Medicine
  • Public Health Policy

Background:

  • A new Emergency Department (ED) opened at Waitakere Hospital in West Auckland, New Zealand, in February 2005.
  • The establishment of this ED was partly motivated by the expectation of reducing patient attendances at existing Auckland region EDs.

Purpose of the Study:

  • To evaluate the impact of the new Waitakere Hospital ED on ED presentation rates in the Auckland region.
  • To determine if the new ED led to a decrease in attendances at established hospitals.

Main Methods:

  • A retrospective analysis of ED presentations was conducted for two years before and two years after the Waitakere ED opening.
  • Control charts were used to assess the effect on other hospitals, with Middlemore Hospital serving as a control.
  • Data from Auckland City, Starship Children's, and North Shore hospitals were compared.

Main Results:

  • Overall ED attendances in the Auckland District Health Board area rose by 9% (Auckland Hospital 13%, Starship 2%), aligning with population growth.
  • Middlemore Hospital saw a 6% increase in ED attendances, also consistent with population growth.
  • Waitemata District Health Board hospitals (North Shore and Waitakere) experienced a 74% surge in ED attendances, significantly exceeding the 8% population growth.

Conclusions:

  • The opening of the Waitakere ED may have contributed to an overall increase in regional ED presentations.
  • No reduction in attendances was observed at neighboring hospitals following the new ED's establishment.
  • The new ED's impact appears to be an increase in overall regional demand rather than a redistribution of patient flow.