Table 2 Uni- and multivariate analysis of comparison of patients with and without the appearance of left ventricular (LV) dysfunction

	With LV dysfunction	Without LV dysfunction	Univariate	Multivariate		p Value
	With LV dysfunction	Without LV dysfunction	p Value	95% CI	Odds ratio	p Value
Number	13	226
Age (years)	51 (12)	42 (12)	0.013*	−0.0964 to 0.0043	1.28	0.075
Gender (F:M)	8:5	113:113	0.418
Systolic blood pressure (mm Hg)	133 (11)	132 (11)	0.819
Diastolic blood pressure (mm Hg)	78 (8)	76 (7)	0.265
Complications	HT 0, HL 1	HT 16, HL 10	0.311
	DM 0	DM 9
Beta-blockers (n)	1	20	0.886
Left ventricular ejection fraction (%) initial	69 (7)	64 (6)	0.004*	−0.3032 to −0.0572	18.2	0.002*
Left ventricular diastolic dimension (mm) initial	45 (5)	46 (4)	0.579
PVCs (beats/day) initial	29 224 (20 181)	11 313 (10 916)	<0.001*	−0.0001 to −0.0052	85.4	<0.001*
PVC grade (highly/moderate/less)	9/1/3	37/104/85	<0.001*	−0.7182 to 1.6045	2.53	0.226
NSVT (>3 beats, %) initial	38.4	17.7	0.062

*Statistically significant differences between the groups with and without LV dysfunction.
CI, confidence interval; DM, diabetis mellitus; HL, hyperlipidaemia; HT, hypertension; NSVT, presence of non-sustained ventricular tachycardia; PVC, premature ventricular contraction.