Table 1.

Modeling children’s visual production behavior

	Estimate	Std. Error	z value	Pr(>∣z∣)	2.5% CI	97.5% CI
Intercept	−0.690	0.173	−3.979	<0.0001	−1.030	−0.350
Age (in years)	0.251	0.020	12.805	<0.0001	0.212	0.289
Est. drawing frequency	−0.062	0.173	−0.356	0.721	−0.402	0.278
Avg. tracing rating	0.267	0.020	13.529	<0.0001	0.229	0.306
Time spent drawing	0.039	0.021	1.868	0.062	−0.002	0.079
Ink used	−0.031	0.020	−1.546	0.122	−0.070	0.008
Number of strokes	0.008	0.018	0.477	0.634	−0.026	0.043
Age × Drawing frequency	0.017	0.017	1.042	0.298	−0.015	0.050

Results of a generalized linear mixed-effect model predicting the recognizability of each drawing (i.e., binary classification scores) from VGG-19 FC6 classifications, including random intercepts for each category and participant. All predictors were z-scored prior to analysis such that coefficients are standardized and comparable. All significance tests are Wald significance tests based on the coefficient values; these tests are two-tailed. No adjustments were made for multiple comparisons. See Methods for further model specifications.