Table 1.

Characteristics of subsamples based on sex, with age- and BMI-adjusted comparisons

	Girls (n = 232)		Boys (n = 290)		t(522)a	p	d
	M	SD	M	SD
Age	16.97	0.82	16.99	0.81	− 0.22	.820	− 0.02
BMI	20.25	1.99	21.37	2.80	− 5.05	< .001	− 0.45
EDE dietary restraint	1.68	1.62	0.54	0.85	10.29	< .001	0.91
EDE eating concern	1.41	1.34	0.42	0.69	10.82	< .001	0.95
EDE weight concern	2.29	1.73	0.78	0.95	12.63	< .001	1.11
EDE shape concern	2.75	1.74	1.01	1.11	13.79	< .001	1.21
EDE total score	2.03	1.48	0.69	0.75	13.38	< .001	1.18
BUT weight phobia	2.21	1.32	0.90	0.80	13.93	< .001	1.23
BUT body image concern	1.88	1.28	0.84	0.87	10.86	< .001	0.95
BUT avoidance	0.74	0.92	0.16	0.32	9.90	< .001	0.87
BUT compulsive self-monitoring	1.69	1.15	0.79	0.72	10.89	< .001	0.96
BUT depersonalisation	1.20	2.83	0.36	1.52	4.31	< .001	0.38
BUT global severity index	1.57	1.07	0.63	0.56	12.99	< .001	1.14
MDDI drive for size	–	–	10.98	4.74	–	–	–
MDDI appearance intolerance	–	–	6.09	2.95	–	–	–
MDDI functional impairment	–	–	6.52	3.56	–	–	–
MDDI total score	–	–	23.60	8.03	–	–	–

		Girls (n = 232)		Boys (n = 290)		χ2	p	V
		n	%	n	%
Weight	Underweight	34	15.3%	23	8.0%	17.95	< .001	0.19
	Normal weight	182	81.9%	230	80.8%
	Overweight	6	2.7%	32	11.2%
Weekly hours of activity	No sport	65	28.0%	40	13.8%	49.40	< .001	0.31
	Lower tertile	83	35.8%	56	19.3%
	Intermediate tertile	39	16.8%	100	34.5%
	Upper tertile	45	19.4%	94	32.4%
Sport type	No sport	65	28.0%	40	13.8%	40.70	< .001	0.28
	Individual sport	135	58.2%	143	49.3%
	Team sport	32	13.8%	107	36.9%

M mean, SD standard deviation, d Cohen’s d, V Cramer’s V, BMI body mass index, EDE Eating Disorder Examination Questionnaire, BUT body uneasiness test, MDDI muscle dysmorphia disorder inventory

^aN = 507 (285 boys, 222 girls) for analyses involving BMI