Related Experiment Video
Updated: Jul 11, 2026
11:05
SECONDs Administration Guidelines: A Fast Tool to Assess Consciousness in Brain-injured Patients
Published on: February 6, 2021
The limited reliability of the Ramsay scale
Daiwai Olson1, Mary Lynn, Suzanne M Thoyre
1Duke University, Durham, NC, USA. dmolson@email.unc.edu
Neurocritical Care
|September 27, 2007
Summary
The Ramsay scale, a sedation assessment tool, showed poor inter-rater reliability in a study of 237 nurses. Findings suggest insufficient evidence to support its reliability for sedation assessment.
Area of Science:
- Critical Care Nursing
- Clinical Assessment Tools
- Psychometric Evaluation
Background:
- The Ramsay scale is a widely used international tool for assessing patient sedation.
- Despite its frequent citation, the Ramsay scale lacks comprehensive psychometric evaluation.
- Concerns exist regarding the reliability of the Ramsay scale in clinical practice.
Purpose of the Study:
- To evaluate the inter-rater reliability of the Ramsay scale.
- To provide a psychometric analysis of the Ramsay scale's performance.
- To determine if the Ramsay scale is a dependable measure for sedation assessment.
Main Methods:
- Prospective, single-blinded randomized study design.
- 237 critical care nurses from a major teaching institution participated.
- Nurses scored randomly selected sedation assessment videos using the Ramsay scale after reviewing instructions.
Main Results:
- A low Kappa statistic of 0.28 was obtained across 237 nurses.
- This indicates poor agreement between nurses when using the Ramsay scale.
- The results suggest significant variability in sedation scoring.
Conclusions:
- There is insufficient evidence to support the reliability of the Ramsay scale.
- The scale's dependability as a measure of sedation assessment is questionable.
- Further research is needed to validate sedation assessment tools.
Related Concept Videos
01:29Reliability and Validity
Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.
01:20Random and Systematic Errors
Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
00:54Ratio Level of Measurement
The way a set of data is measured is called its level of measurement. Correct statistical procedures depend on a researcher being familiar with levels of measurement. For analysis, data are classified into four levels of measurement—nominal, ordinal, interval, and ratio.
A set of data measured using the ratio scale takes care of the ratio problem and provides complete information. Ratio scale data are like interval scale data, except they have a zero point and ratios can be calculated. For...
A set of data measured using the ratio scale takes care of the ratio problem and provides complete information. Ratio scale data are like interval scale data, except they have a zero point and ratios can be calculated. For...
01:20Spearman's Rank Correlation Test
Spearman's rank correlation test, also known as Spearman's rho, is a nonparametric method for assessing the strength and direction of association between two variables. This test is particularly valuable when the data distribution is unknown or when the assumption of normality does not hold. Named after the English psychologist and statistician Dr. Charles Edward Spearman, it serves as the nonparametric counterpart to Pearson's correlation coefficient.
Spearman's test calculates correlation by...
Spearman's test calculates correlation by...
03:37Uncertainty in Measurement: Accuracy and Precision
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
01:20Lazarus's Cognitive Appraisal Theory
Cognitive psychologist Richard Lazarus proposed the cognitive-mediational theory of emotions, which emphasizes how individuals' assessments of stressors significantly affect their experience of stress. According to Lazarus, the stress response is determined by a two-step appraisal process: primary appraisal and secondary appraisal. These cognitive appraisals help individuals evaluate the potential impact of a stressor and determine the adequacy of their coping resources.
Primary Appraisal:...
Primary Appraisal:...