In response to the label and other adjustments made last month (April 2026) to the data files for the 36-month-old and 84-month-old groups, our project has updated the following two files for these age groups:

(1) Data Usage Instructions (see pp. 7–8 for updates);

(2) Cross-Wave Variable Comparison Table (The variable [lanb01] and the five other variables in the Language Development Questionnaire have been updated to multiple subdimensions)