Fig. 2From: Prevalence, correlates, and trajectory of screen viewing among Chinese children in Changsha: a birth cohort studyMeasurement of latent growth model with time-invariant and time-variant covariates for screen time. (Time-invariant covariates include age, family member number, family income, pregnancy computer use, pregnancy phone use, pregnancy depression symptom, maternal age, maternal educational level, maternal occupation, maternal race, paternal age, paternal educational level, paternal occupation, paternal race. PA Outdoor play, ST Screen time)Back to article page