Study of attention measured by event-related potential as a predictive factor of violence among patients with schizophrenia and substance use disorder

Middle East Current Psychiatry

Table 5 The relationship between psychiatric disorders and P300 wave amplitude and latency

	SUD pt. (n= 32)	Dual diagnosis pt. (n= 16)	Schizophrenia pt. (n= 38)	^KWχ²	P
P300 amplitude
Min.–max.	2.90–51.0	7.90–40.20	11.80–65.30	29.415^*	< 0.001^*
Mean ± SD	18.18 ± 12.91	23.39 ± 9.72	36.34 ± 11.74
Median	14.25	21.20	37.55
Sig. bet. grop.	P₁ = 0.052, P₂ < 0.001^, P₃ < 0.001^
P300 latency
Min.–max.	232.23–553.35	263.80–923.10	156.90–825.30	38.637*	< 0.001*
Mean ± SD	367.05 ± 80.98	650.18 ± 158.02	658.06 ± 175.0
Median	357.55	667.05	699.65
Sig. bet. grop.	P₁₀ < 0 .001, P₂₀ < 0.001, P₃₀ = 0.384

KW chi-square test value for Kruskal Wallis test, P₁P value for Mann Whitney test for comparing between SUD pt. and dual diagnosis pt., P₂P value for Mann Whitney test for comparing between SUD pt. and schizophrenia pt., P₃P value for Mann Whitney test for comparing between dual diagnosis pt. and schizophrenia pt., P₁₀P value for Mann Whitney test for comparing between SUD pt. and dual diagnosis pt., P₂₀P value for Mann Whitney test for comparing between SUD pt. and schizophrenia pt., P₃₀P value for Mann Whitney test for comparing between dual diagnosis pt. and schizophrenia pt.
*Statistically significant at P ≤ 0.05