Figure 1 - uploaded by Samira Norouzrajabi
Content may be subject to copyright.
Sample size formula.

Sample size formula.

Source publication
Article
Full-text available
Background: Patients under mechanical ventilation are at risk of ventilator-associated complications. One of these complications is lung injury due to high tidal volume. Nurses’ competence in mechanical ventilation is critical for preventing ventilator-associated complications. This study assessed the effects of feedback and education on nurses’ cl...

Contexts in source publication

Context 1
... size was used for determining sample size. Accordingly, with a power of 0.90, a confidence level of 0.95, and an effect size of 0.55, the sample size calculation formula (Figure 1) revealed that 35 nurses were required for the study. At least, two nurses were conveniently selected from each of the wards of the study setting. ...
Context 2
... least, two nurses were conveniently selected from each of the wards of the study setting. The same sample size calculation formula ( Figure 1) also revealed that with a power of 0.90, a confidence level of 0.95, and an effect size of 0.21, 238 patients were needed. Accordingly, 250 patients were selected for pretest Vt assessment and another 250 patients were selected for post-test Vt assessment. ...

Similar publications

Preprint
Full-text available
Background: Ventilation with low tidal volume (VT) is advised for critically ill patients to protect against ventilator-induced lung injury and provide better clinical outcomes. Previous studies showed poor compliance with using height to predict the VT. Ulna length has been used successfully to predict protective low VT. Our study aims to evaluate...