Moderate-to-vigorous physically active academic lessons and academic engagement in children with and without a social disadvantage: a within subject experimental design

Table 5 Multilevel regression coefficients (B) and Standard Error (SE) for each factor predicting time-on-task

	Model 1			Model 2			Model 3			Model 4
	B	SE	p	B	SE	p	B	SE	p	B	SE	p
Fixed effects
Random intercept	96.18	5.39		97.37	4.18		97.45	4.19		99.21	4.24
Grade^a	4.98	1.34	0.00	4.97	1.34	0.00	4.97	1.34	0.00	5.02	1.34	0.00
BMI	−0.75	0.22	0.00	−0.75	0.23	0.00	−0.75	0.23	0.00	−0.74	0.23	0.00
SDC^b	−4.47	1.58	0.00	−4.57	1.57	0.00	−4.95	1.99	0.01	−4.58	1.57	0.00
Midway observation^c	−2.90	1.25	0.02	−2.87	1.22	0.02	−2.88	1.22	0.02	−5.81	1.74	0.00
End observation^c	0.51	1.25	0.68	0.67	1.22	0.58	0.67	1.22	0.58	−2.17	1.71	0.11
Condition^d				4.19	0.99	0.00	4.02	1.13	0.00	0.40	1.72	0.82
Condition*SDC							0.71	2.34	0.76
Condition*midway										5.63	2.41	0.02
Condition*end										5.54	2.40	0.02
Random effects
Variance between students	12.57	5.40	0.02	13.28	5.35	0.01	13.32	5.36	0.01	13.70	5.35	0.01
Variance within students	108.39	8.21	0.00	103.24	7.82	0.00	103.18	7.81	0.00	101.14	7.66	0.00
Deviance	3250.83			3233.27			3233.18			3225.25

^a,b,c,d Respectively second grade, non-SDC, start observation and control condition were the reference categories.

ISSN: 1471-2458