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Table 1 Internal consistencies (Cronbach’s alphas, α), descriptives, and group differences for the sub-dimensional, dimensional and the total scores of the Youth Psychopathic traits Inventory (YPI) in 15- to 16-year-old Finnish and Dutch boys and girls

From: Short report: self-reported psychopathic traits in Finnish and Dutch samples of non-referred adolescents: exploration of cultural differences

  Internal consistency Descriptives and group differences
  Finnish boys Dutch boys Finnish boys (n = 174) Dutch boys (n = 221) Statistics
α α Mean (SD) Median Mean (SD) Median U p Cohen’s d
YPI sub-dimension
 Dishonest charm 0.81 0.74 1.81 (0.67) 1.80 2.02 (0.65) 2.00 15,325.50 0.001 −0.318
 Grandiosity 0.79 0.81 1.89 (0.68) 1.80 1.86 (0.77) 1.75 18,074.50 NS 0.041
 Lying 0.82 0.72 1.80 (0.67) 1.80 2.01 (0.65) 2.00 15,343.00 0.001 −0.318
 Manipulation 0.86 0.81 1.70 (0.69) 1.60 1.98 (0.71) 1.80 14,399.00 <0.001 −0.440
 Remorselessness 0.83 0.63 1.69 (0.64) 1.60 2.01 (0.61) 2.00 12,963.00 <0.001 −0.440
 Unemotionality 0.65 0.50 2.15 (0.63) 2.20 2.24 (0.55) 2.20 1741.00 NS −0.152
 Callousness 0.41 0.25 2.23 (0.51) 2.20 2.52 (0.46) 2.40 13,308.50 <0.001 −0.440
 Thrill-seeking 0.80 0.55 2.55 (0.72) 2.60 2.78 (0.57) 2.80 15,541.50 0.001 −0.353
 Impulsiveness 0.73 0.62 2.14 (0.67) 2.00 2.37 (0.62) 2.40 15,298.00 <0.001 −0.440
 Irresponsibility 0.74 0.60 1.85 (0.70) 1.80 1.85 (0.67) 1.80 18,782.00 NS 0.000
YPI dimension
 Interpersonal 0.90 0.85 7.19 (2.37) 7.00 7.88 (2.31) 7.40 15,686.50 0.002 −0.294
 Affective 0.55 0.61 6.07 (1.30) 6.00 6.77 (1.24) 6.80 12,756.50 <0.001 −0.440
 Behavioral 0.86 0.71 6.54 (1.84) 6.35 7.01 (1.44) 6.80 15,886.50 0.003 −0.285
 YPI Total 0.84 0.74 19.81 (4.91) 19.60 21.66 (4.18) 21.25 14,360.00 <0.001 −0.440
  Finnish girls Dutch girls Finnish girls (n = 198) Dutch girls (n = 253) Statistics
α α Mean (SD) Median Mean (SD) Median U p Cohen’s d
YPI sub-dimension
 Dishonest charm 0.82 0.75 1.72 (0.66) 1.60 1.72 (0.60) 1.60 24,243.00 NS 0.000
 Grandiosity 0.82 0.76 1.58 (0.61) 1.40 1.34 (0.48) 1.20 18,940.00 <0.001 0.437
 Lying 0.77 0.78 1.64 (0.60) 1.40 1.64 (0.62) 1.40 24,980.50 NS 0.000
 Manipulation 0.81 0.77 1.62 (0.63) 1.40 1.57 (0.57) 1.40 24,491.50 NS 0.083
 Remorselessness 0.78 0.63 1.43 (0.52) 1.33 1.59 (0.52) 1.40 19,669.50 <0.001 −0.308
 Unemotionality 0.65 0.57 1.79 (0.54) 1.70 1.71 (0.47) 1.60 23,036.00 NS 0.158
 Callousness 0.44 0.46 1.67 (0.48) 1.60 1.89 (0.52) 1.80 18,583.00 <0.001 −0.440
 Thrill-seeking 0.78 0.72 2.47 (0.65) 2.55 2.51 (0.64) 2.40 24,538.00 NS −0.062
 Impulsiveness 0.77 0.71 2.20 (0.67) 2.20 2.32 (0.64) 2.20 22,805.50 NS 0.183
 Irresponsibility 0.68 0.59 1.60 (0.57) 1.40 1.56 (0.51) 1.40 24,746.00 NS 0.074
YPI dimension
 Interpersonal 0.87 0.83 6.56 (2.12) 6.20 6.28 (1.86) 5.80 23,538.00 NS 0.140
 Affective 0.73 0.61 4.89 (1.24) 4.60 5.18 (1.11) 5.00 20,389.00 0.001 −0.246
 Behavioral 0.80 0.76 6.27 (1.59) 6.20 6.39 (1.47) 6.20 23,852.00 NS −0.078
 YPI Total 0.77 0.76 17.71 (4.18) 17.10 17.84 (3.72) 17.20 24,342.00 NS −0.032
  1. Comparisons are performed using the Mann–Whitney U test. Effect sizes are reported
  2. NS not statistically significant