Table 3.

The preoperative levels of β-endorphin in the study group (with ovarian cancer—III–IV stage according to FIGO) and the control group (with benign neoplastic lesions and simple ovarian cysts).

	FIGO III,IV (n = 68)		Control Group (n = 61)				95% CI
	M	SD	M	SD	Vol	p	LL	UL	d Cohen
β-endorphin levels	208.6	14.23	302.00	24.49	−28.67	<0.001	−102.39	−91.98	4.96

M—median; SD—standard deviation; p—significance level; 95% CI—confidence interval, LL—lower limit; UL—upper limit; d Cohen—the size of the effect.