Validation of the lithuanian version of the self-evaluation of negative symptoms scale (SNS)

Figures & data

Table 1. BPRS and Lith-SNS scores and subscores*.

	Mean score (± SD)	Differences between gender
		Male	Female	p
BPRS POZ	4.15 (± 1.46)	4.46 (± 0.36)	3.98 (± 0.19)	0.09
BPRS NEG	10.42 (± 3.95)	10.25 (± 3.96)	10.51 (± 3.98)	0.997
SNS SW	4.33 (± 2.64)	4.46 (± 2.77)	4.26 (± 2.6)	0.597
SNS DE	3.49 (± 1.69)	3.88 (± 1.96)	3.28 (± 1.5)	0.244
SNS A	4.03 (± 2.93)	4.5 (± 3.41)	3.77 (± 2.64)	0.998
SNS AV	4.03 (± 2.2)	3.83 (± 2.01)	4.14 (± 2.32)	0.29
SNS AN	3.27 (± 2.1)	3.17 (± 2.06)	3.33 (± 2.15)	0.486
SNS OV	18.61 (± 8.79)	18.83 (± 8.84)	18.49 (± 8.87)	0.705

*BPRS POZ = positive subscore of BPRS; BPRS NEG = negative subscore of BPRS, SNS SW = subscore of SNS social withdrawal questions; SNS DE = subscore of SNS diminished emotional range questions; SNS A = subscore of SNS alogia questions; SNS AV = subscore of SNS avolition question; SNS AN = subscore of SNS anhedonia questions; SNS OV = overall score of SNS.

Table 2. Principal component analysis, varimax rotated component matrix.

SNS subscores*	Factors
	1	2
Lith-SNS SW	0.851**	0.196
Lith-SNS DE	0.786	0.116
Lith-SNS AN	0.753	0.403
Lith-SNS AV	0.240	0.779
Lith-SNS A	0.158	0.833

*Lith-SNS SW = subscore of Lith-SNS social withdrawal questions; Lith-SNS DE = subscore of Lith-SNS diminished emotional range questions; Lith-SNS A = subscore of Lith-SNS alogia questions; Lith-SNS AV = subscore of Lith-SNS avolition question; Lith-SNS AN = subscore of Lith-SNS anhedonia questions; **Correlations of each of the factors with the SNS subscores.

Table 3. Correlation between BPRS* negative subscores and Lith-SNS scores**(Pearson r scores, all p < 0.001).

	Lith-SNS SW	Lith-SNS DE	Lith-SNS A	Lith-SNS AV	Lith-SNS AN	Lith-SNS OV
BPRS BA	0.624	0.553	0.591	0.512	0.667	0.749
BPRS EW	0.626	0.405	0.565	0.411	0.542	0.657
BPRS MR	0.683	0.536	0.732	0.64	0.722	0.85
BPRS NE	0.726	0.566	0.714	0.595	0.731	0.853

*BPRS BA = BPRS item 16, blunted affect score; BPRS EW = BPRS item 3, emotional withdrawal score; BPRS MR = BPRS item 13, motor retardation subscore, BPRS NE = sum of BPRS BA, EW and MR; ** Lith-SNS SW = subscore of Lith-SNS social withdrawal questions; Lith-SNS DE = subscore of Lith-SNS diminished emotional range questions; Lith-SNS A = subscore of Lith-SNS alogia questions; Lith-SNS AV = subscore of Lith-SNS avolition question; Lith-SNS AN = subscore of Lith-SNS anhedonia questions; Lith-SNS OV = overall score of Lith-SNS.

Data availability statement

Due to the nature of this research and the requirements of Bioethics committee, data is not available publicly but could be received from the corresponding author upon demand.