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Table 3 Inter-group and intra-group comparison of sleep quality scores of patients with thalassemia major

From: Effects of a positive thinking program on hope and sleep quality in Iranian patients with thalassemia: a randomized clinical trial

Time Before intervention Immediately after intervention One month after the intervention P value*
Variable Group Mean SD Mean SD Mean SD
Hope Experimental 21.1 4.4 26.7 5.8 26.2 2.0  < 0.001
Control 21.1 5.1 20.4 3.7 20.3 4.5 0.042
P value** 0.986  < 0.001***  < 0.001***  
  1. *Friedman Test
  2. **Mann–Whitney U Test
  3. *** Large Effect size