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Table 2 Comparison of mean anxiety level in patients of both groups before and after the intervention

From: The effect of natural sounds on the anxiety of patients undergoing coronary artery bypass graft surgery

Groups Time of intervention Results of repeated measures ANOVA
Before intervention 30 min after the intervention In the waiting room p valueb p valuec
Mean ± SD Mean ± SD Mean ± SD
Intervention group 4.37 ± 47.66 7.21 ± 43.68 7.11 ± 42.95 0.34 0.001
Control group 5.17 ± 48.44 6.69 ± 50.57 6.78 ± 51.28
p valuea 0.44 0.001 0.001
  1. aIndependent t-test (inter-group comparison)
  2. bRepeated measures ANOVA (intra-group comparison)
  3. cRepeated measures ANOVA (interactive effect)