Table 1.

Descriptive statistics of main study variables

	N	Min	Max	M	SD
Friendship Quality Tl	1180	1.30	4.00	3.35	0.49
Friendship Quality T2	1195	1.30	4.00	3.33	0.50
Friendship Quality T3	1142	1.30	4.00	3.33	0.51
CU traits Tl	1079	7.00	58.00	33.33	6.91
CU traits T2	1260	15.00	55.00	32.49	6.70
CU traits T3	1227	13.00	59.00	32.09	6.88
Grandiose-Manipulative traits Tl	1079	12.00	80.00	40.19	11.78
Grandiose-Manipulative traits T2	1260	19.00	80.00	38.91	11.38
Grandiose-Manipulative traits T3	1227	11.00	80.00	38.25	11.65
Impulsive-Irresponsible traits T1	1079	15.00	60.00	35.60	8.29
Impulsive-Irresponsible traits T2	1260	15.00	60.00	34.73	8.37
Impulsive-Irresponsible traits T3	1227	15.00	59.00	33.91	8.70
Suppression of Aggression Tl	1261	1.00	5.00	2.82	.96
Suppression of Aggression T2	1260	1.00	5.00	2.91	.94
Suppression of Aggression T3	1228	1.00	5.00	2.95	.98

Note. Higher scores for friendship quality variables indicate high quality.