The role of sense of coherence and loneliness in borderline personality disorder traits: a longitudinal twin study

Table 1 Twin sample characteristics

	N single twins	N twin pairs	MZ twin pairs^a	DZ twin pairs^a
Questionnaire-data
12–13 years	852	432	165	255
14–15 years	1501	767	276	458
16–17 years	1792	922	329	541
18 years	1371	782	221	368
Interview-data	2808	1424	541	843

ISSN: 2051-6673