The effect of the demonstration-based progressive muscle relaxation technique on stress and anxiety in nurses caring for COVID-19 patients: a randomized clinical trial

Table 5 Comparing nurses' stress and anxiety scores in experimental and control groups before and after intervention

Groups		Experimental		Control		Independent-samples t -test
Variables		Pre-test	Post-test	Pre-test	Post-test	Pre-test	Post-test
Stress	Mean (SD)	13.91 (2.41)	10.95 (2.01)	14.34 (2.74)	14.17 (2.34)	t = -0.571 p = 0.571	t = -4.991 p < 0.001 Cohen's d = 1.47
Stress	Paired-samples t -test	t = 6.314 df = 22 p < 0.001		t = 1.164 df = 22 p = 0.257		p = 0.571	p < 0.001
Anxiety	Mean (SD)	13.34 (3.41)	9.47 (2.37)	12.78 (2.21)	12.91 (1.85)	t = -0.665 p = 0.509	t = -5.469 p < 0.001 Cohen's d = 1.61
Anxiety	Paired-samples t -test	t = 8.203 df = 22 p < 0.001		t = -0.720 df = 22 p = 0.479

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