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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Dev Psychol. 2017 Nov 20;54(3):586–599. doi: 10.1037/dev0000449

Figure 1.

Figure 1

Depiction of using construct-valid items at each age with a common-item design. Item set A corresponds to items that are construct-valid at only T1. Item set B corresponds to items that are construct-valid at both T1 and T2. Item set C corresponds to items that are construct-valid at only T2. The “common items” (item set B) are highlighted in gray. The present study used the construct-valid items at each age (approach 3: i.e., item sets A and B at T1 and item sets B and C at T2), by using the common items to link the different item sets. Although there were more than two time points (10) in the present study, we used only two different measures (hence we depict the common item-design with T1 and T2 for simplicity).