Table 3.

Negative binomial generalised linear models showing the direction of effects and the significance level of the terms in the clip art picture discrimination (training for task 3: inferential reasoning by exclusion)

Response variable	Model	Minimal model	Average effect	SE	Wald statistic	z	p value
Number of sessions to criterion	Model 5	Age in months	0.0100	0.0017	32.326		<0.001
		Stimulus group: B	0.2707	0.1095	5.908		0.015
		Sex: male	0.3507	0.1169	8.710		0.003
		Reward ratio 90 %	0.3486	0.1545	4.877		0.027
	Model 6	Age group			29.633		<0.001
		Age group 2	0.0612	0.2046		0.2990	0.765
		Age group 3	0.1162	0.2088		0.5570	0.578
		Age group 4	0.6525	0.2193		2.9750	0.003
		Age group 5	0.8879	0.2215		4.0090	<0.001
Number of correction trials	Model 7	Age in months	0.0118	0.0019	37.953		<0.001
		Stimulus group: B	0.4313	0.1250	11.169		<0.001
		Sex: male	0.3184	0.1253	6.296		0.012
	Model 8	Age group			32.130		<0.001
		Age group 2	0.3174	0.2287		1.388	0.165
		Age group 3	0.2992	0.2338		1.280	0.201
		Age group 4	0.6798	0.2490		2.730	0.006
		Age group 5	1.2756	0.2525		5.053	<0.001

Z tests indicate which age groups differ from age group 1 in the respective analysis. Bold numbers indicate significant values at p = ≤0.05