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Table 2 Comparison of the sleep quality before and after the intervention in study groups

From: Comparing the effect of aromatherapy with peppermint and lavender on the sleep quality of cardiac patients: a randomized controlled trial

 Sleep quality score 
Groups
PeppermintLavenderControlP-value
InterventionMed(IQR#)95%ciMed (IQR)95%ciMed (IQR)95%ci 
Before15(2)14.4,15.315|(2)14.3,15.314(2)13.6,14.51* $
After4(2)3.2,4.75(3)4.1,5. 614(5)11.8,14.4< 0.001$
P-value< 0.001&< 0.001&0.275& 
  1. *Non-significant, $ Based on Kruskal-Wallis H test, # Interquartile Range, & Based on Wilcoxon signed-rank test
  2. There was a significant difference between sleep quality scores before and after intervention in each of the lavender and peppermint groups; but in control group, the mean‌ scores of sleep quality before and after intervention were not statistically significant