The ATUS categorization doesn't have a top-level category for computer use, and some varieties of computer use get recorded in ways that don't indicate that a c

The ATUS categorization doesn't have a top-level category for computer use, and some varieties of computer use get recorded in ways that don't indicate that a computer was involved. So the actual amount of computer use time might be bigger than reported, both because not all computer use is explicitly recorded as such and because whoever made the interactive graphic might have missed some categories.