TABLE 4.

Cox-regressions for children’s acquisition of Mass theory at T2.

					95% CI
	b	SE	z	HR	LL	UL
Development of consistencies between groups (Cox-regression)
ΔFree play–Verbal	1.31*	0.65	2.01	3.70	1.03	13.26
ΔMaterial–Verbal	0.69	0.58	1.18	1.99	0.63	6.26
ΔFree play–Material	0.62	0.76	0.81	1.86	0.42	8.31
Fluid intelligence	0.04	0.06	0.69	1.04	0.93	1.16
CrI	0.08*	0.03	2.41	1.08	1.01	1.15
Interaction of crystallized intelligence with intervention group
ΔFree play–Verbal*CrI	–0.05	0.11	–0.44	0.95	0.76	1.19
ΔMaterial–Verbal*CrI	0.15*	0.07	2.15	1.67	1.01	1.34
ΔFree play–Material*CrI	–0.20	0.12	–1.71	0.82	0.65	1.03
CrI free play	0.16	0.10	1.58	1.18	0.96	1.44
CrI material	–0.04	0.06	–0.68	0.96	0.86	1.08
CrI verbal	0.11**	0.04	2.65	1.12	1.03	1.22
Fluid intelligence	0.05	0.06	0.87	1.05	0.94	1.18

CrI, crystallized intelligence; HR, hazard ratio; CI, 95% confidence-interval; LL, lower level; UL, upper level. * p < 0.05. ** p < 0.01.