Table 2.

Expert validity for the first and final iterations, cross-mode similarity for the paper and the multimedia version, and test-retest reliability for the multimedia version.

Psychometrics		Overall	Child age (months)
			4	6	9	12	15	18	24	30	36	42	48	60	72
Expert validity, CVI
	First iteration		0.97	0.95	0.99	0.69	0.95	0.85	0.96	0.85	0.90	0.81	0.90	0.86	0.86
	Final iteration		1.00	1.00	1.00	0.95	1.00	0.91	1.00	0.92	1.00	1.00	1.00	1.00	1.00
Cross-mode similarity, mode intraclass correlation		0.94	0.94	0.88	0.89	0.85	0.89	0.95	0.89	0.96	0.95	0.96	0.92	0.94	0.96
Test-retest reliability, r		.93	.95	.89	.90	.87	.91	.95	.91	.96	.95	.96	.92	.95	.97