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Table 1 Descriptives and mean group differences in the Youth Psychopathic traits Inventory (YPI) and the Antisocial Process Screening Device-self-report (APSD-SR) scores between 15- to 16-year-old boys (n = 174) and girls (n = 198) attending the 9th grade at 5 secondary schools in Finland. Comparisons are performed using the Mann–Whitney U-test. Effect sizes (Cohen’s d) are reported

From: Self-reported psychopathic traits among non-referred Finnish adolescents: psychometric properties of the Youth Psychopathic traits Inventory and the Antisocial Process Screening Device

  Boys Girls Statistics
  Mean (SD) Minimum-maximum Median Skewness (SE = 0.184) Kurtosis (SE = 0.366) Mean (SD) Minimum-maximum Median Skewness (SE = 0.173) Kurtosis (SE = 0.344) Mann–Whitney U Test Cohen’s d
YPI Sub-dimension
Dishonest charm 1.80 (0.68) 1.00-4.00 1.80 0.839 0.579 1.73 (0.66) 1.00-4.00 1.60 0.860 0.309 16083.50 0.104
Grandiosity 1.89 (0.68) 1.00-4.00 1.80 1.040 1.103 1.58 (0.61) 1.00-3.60 1.40 1.079 0.529 12092.50* 0.480
Lying 1.80 (0.67) 1.00-4.00 1.80 0.887 0.687 1.65 (0.61) 1.00-4.00 1.50 0.927 0.381 14955.00** 0.234
Manipulation 1.69 (0.69) 1.00-4.00 1.50 1.075 0.838 1.63 (0.62) 1.00-4.00 1.40 1.058 0.973 16690.50 0.091
Remorselessness 1.69 (0.64) 1.00-4.00 1.60 1.256 1.962 1.44 (0.53) 1.00-4.00 1.40 1.810 4.532 12999.50* 0.425
Unemotionality 2.13 (0.56) 1.00-4.00 2.20 0.306 0.442 1.80 (0.53) 1.00-4.00 1.80 1.319 2.733 10740.00* 0.605
Callousness 2.23 (0.50) 1.00-3.40 2.20 −0.292 −0.135 1.67 (0.47) 1.00-4.00 1.60 0.970 2.183 6988.00* 1.154
Thrill-seeking 2.55 (0.72) 1.00-4.00 2.60 0.021 −0.530 2.49 (0.64) 1.00-4.00 2.60 0.006 −0.322 16349.00 0.088
Impulsiveness 2.14 (0.67) 1.00-4.00 2.00 0.347 −0.348 2.22 (0.67) 1.00-4.00 2.20 0.242 −0.447 15909.50 −0.119
Irresponsibility 1.85 (0.70) 1.00-4.00 1.80 0.754 −0.102 1.60 (0.57) 1.00-3.80 1.40 1.114 1.058 13722.00* 0.392
YPI Dimension
Interpersonal 7.18 (2.38) 4.00-16.00 7.00 0.998 1.635 6.59 (2.10) 4.00-15.40 6.40 1.024 1.381 14645.00** 0.263
Affective 6.05 (1.26) 3.00-11.40 6.00 0.768 1.724 4.92 (1.25) 3.00-12.00 4.60 1.667 5.534 8097.50* 0.900
Behavioral 6.54 (1.84) 3.00-12.00 6.35 0.390 −0.287 6.31 (1.60) 3.20-11.40 6.20 0.414 −0.960 16166.00 0.133
YPI Total 19.77 (4.94) 11.80-38.80 19.60 0.876 1.546 17.82 (4.19) 10.40-37.40 17.20 1.257 3.4160 13066.00* 0.426
APSD-SR Dimension
Interpersonal 0.44 (0.40) 0.00-2.00 0.29 1.212 1.650 0.33 (0.32) 0.00-2.00 0.29 1.788 4.992 11552.50* 0.304
Affective 0.73 (0.34) 0.00-1.67 0.67 0.391 −0.041 0.55 (0.28) 0.00-1.67 0.50 1.038 2.083 14392.50* 0.578
Behavioral 0.73 (0.44) 0.00-2.00 0.80 0.423 −0.218 0.68 (0.43) 0.00-2.00 0.80 0.566 0.219 6197.50 0.115
APSD-SR Total 1.90 (0.82) 0.37-4.33 1.77 0.526 0.022 1.56 (0.77) 0.31-5.18 1.41 1.284 2.901 12658.00* 0.427
  1. *difference is significant at the 0.01 level (2-tailed); **difference is significant at the 0.05 level (2-tailed)