Intervention arm (n = 25)

Control arm (n = 25)

Independent ttest for mean differences in pre and postintervention scores between trial arms


Mean score difference (%, SD)

95% CI

Mean score difference (%, SD)

95% CI

Mean score difference (%, 95% CI)

tvalue (df)

Pvalue


4/23 (19.5, 25.6)

8.930.0

1/23 (4.0, 13.2)

−1.59.5

3/23 (15.5, 3.827.2)

2.69 (35.9) equal variances not assumed

0.011

 Data were normally distributed and parametric tests were used.
 The 95% CI values with minus signs indicate a wide standard deviation within the greater population of nurses, particularly in the control wards, indicating that the sample size may be too small.
 Note: test material is available to reviewers and editors on request. CI, confidence interval, SD, standard deviation; df, degrees of freedom.