Fig 1.
Multidimensional item response theory (MIRT) models examining the structure of the StimQ2.
Note: a. Unidimensional generalized partial credit model; b. Simple structure MIRT model; Component MIRT model; d. Multivariate bi-factor model. Not all subscales or components shown.
Table 1.
Revised StimQ2 subscales with components.
Table 2.
Multi-dimensional item response theory models (MIRT) showing internal structure of the StimQ2.
Table 3.
Subscore analysis for the four subscales of the StimQ2.
Quantities are the PRMSE of the best linear predictor based on either the Subscore (Subscale Score) or the StimQ2 Total Score.
Table 4.
Concurrent relationships between StimQ2 subscales and sub-components and developmental outcomes at 6 months.
Table 5.
Concurrent relationships between StimQ2 subscales and sub-components and developmental outcomes at 14 months.
Table 6.
Concurrent relationships between StimQ2 subscales and sub-components and developmental outcomes at 24 months.
Table 7.
Concurrent relationships between StimQ2 subscales and sub-components and developmental outcomes at 36 months.
Table 8.
Concurrent relationships between StimQ2 subscales and sub-components and developmental outcomes at 54 months.