Trends in childhood and adolescent internalizing symptoms: results from Swedish population based twin cohorts

BMC Psychology

Table 1 Descriptive statistics for all scales used total group and divided by sex

	M (SD) total	M (SD) boys	M (SD) girls	Cohens’d boys vs girls	p boys vs girls	Range (min-max)	n (%) boys/girls
Age 9
SCARED ^a n = 14979	5.25 (6.57)	4.94 (6.47)	5.56 (6.66)	.09	< .001	0–74	7493 (50.0)/ 7486 (50.0)
sMFQ^a n = 17562	1.33 (2.96)	1.40 (3.01)	1.27 (2.91)	.04	.004	0–26	8824 (50.2)/ 8738 (49.8)
Age 15^b
SDQ-Emotional pr n = 9821	1.15 (1.60)	.84 (1.35)	1.44 (1.76)	.38	< .001	0–10	4722 (48.1)/ 5099 (51.9)
SDQ-Emotional sr^c n = 10821	2.93 (2.28)	2.00 (1.80)	3.70 (2.35)	.81	< .001	0–10	4873 (45.0) 5946 (54.9)

Note. SCARED Screen for Child Anxiety Related Emotional Disorders, sMFQ Short Mood and Feelings Questionnaire, SDQ Strength and Difficulties Questionnaire, sr self-report, pr parent-report
^aCohorts 1998–2008
^bCohorts 1993–2001
^cData on sex missing for two participants

ISSN: 2050-7283