Table 2

Descriptive statistics and t test results for continued attendance and dropout groups

Variable	Continued attendance (n=121)		Dropout (n=70)		p	t	d
Variable	Mean	SD	Mean	SD	p	t	d
Demographics
Age (years)	11.77	2.39	12.59	2.53	0.03	2.24	0.33
Anthropometrics and metabolism
BMI z score	2.43	0.55	2.73	0.55	˂0.001	3.60	0.55
Change in BMI z score after 4 months*	0.10	0.20	0.10	0.21	0.81	0.24	0.04
Glucose (mg/dl)	86.42	6.85	86.63	6.23	0.83	0.21	0.03
Insulin (mIU/l)	14.11	7.07	20.20	9.78	˂0.001	4.94	0.71
Cholesterol (mg/dl)
HDL	54.91	13.33	52.00	11.09	0.13	1.54	0.24
LDL	93.23	27.24	92.81	32.42	0.92	0.10	0.01
Triglycerides (mg/dl)	88.38	43.59	110.10	70.46	0.01	2.62	0.37
HOMA-IR	3.04	1.64	4.37	2.22	˂0.001	4.69	0.68
Psychosocial parameters (self-report)
SDQ† conduct	2.23	1.45	2.69	1.59	0.04	2.06	0.30
SDQ† peer relations	2.49	1.93	2.57	1.90	0.78	0.28	0.04
SDQ† hyperactivity	4.10	1.87	4.33	2.13	0.43	0.79	0.11
SDQ† emotional symptoms	3.61	2.30	3.64	2.39	0.94	0.08	0.01
HBSC perceived health 1 excellent—4 poor	2.31	0.80	2.57	0.89	0.04	2.06	0.31
HBSC subjective health‡
-Somatic	16.87	3.02	16.61	3.24	0.58	0.56	0.08
-Psychological	15.07	3.52	14.30	3.99	0.17	1.36	0.21
HBSC self confidence 1 confident—5 not confident	2.18	1.08	2.22	1.07	0.84	0.20	0.04
HBSC self perception 1 content—5 not content	2.31	1.21	2.74	1.28	0.02	2.29	0.35
HBSC body satisfaction 1 satisfied—4 not satisfied	2.52	0.81	2.93	0.89	0.001	3.26	0.48
HBSC life satisfaction 1 satisfied—5 not satisfied	7.14	1.97	6.75	1.90	0.19	1.31	0.20

*n=163; for the 28 children that already dropped out by 4 months, no weight data are available.
†Subscale scores ranging from 0 to 10, with higher scores reflecting more problems.
‡Subscale score ranging from 4 to 20, with higher scores reflecting fewer symptoms.
BMI, body mass index; HBSC, Health Behaviour in School aged Children questionnaire; HDL, high density lipoprotein; HOMA-IR, homeostasis model assessment-estimated insulin resistance; LDL, low density lipoprotein; SDQ, Strengths and Difficulties Questionnaire.