Table A1.
Mixed effects model with study site and family as random intercepts showed that multiple basic demographic variables are associated with total screen media activity.
| Variable | Estimate | StdError | df | T-value | P-value |
| Intercept | −0.1131 | 0.1914 | 5672.147 | −0.5910 | 0.5546 |
| Gender (M) | 0.2585 | 0.0210 | 9587.588 | 12.3383 | <0.0001 |
| Whole brain volume | 0.0000 | 0.0000 | 9447.010 | −2.8873 | 0.0039 |
| Race/Ethnicity | |||||
| Black | 0.3955 | 0.0323 | 8122.383 | 12.2405 | <0.0001 |
| Asian | −0.1395 | 0.0646 | 8960.879 | −2.1578 | 0.0310 |
| Other/Mixed | 0.0236 | 0.0267 | 8278.754 | 0.8848 | 0.3763 |
| Age | 0.0041 | 0.0012 | 9301.023 | 3.4075 | 0.0007 |
| Parental Education | |||||
| HS Diploma/GED | 0.1562 | 0.0590 | 8479.466 | 2.6477 | 0.0081 |
| Some College | 0.1611 | 0.0537 | 8435.787 | 3.0013 | 0.0027 |
| Bachelor | −0.0285 | 0.0568 | 8381.003 | −0.5013 | 0.6162 |
| Post Graduate Degree | −0.2197 | 0.0575 | 8366.119 | −3.8184 | 0.0001 |
| Family Income | |||||
| [≥50K & <100K] | −0.0973 | 0.0294 | 8162.802 | −3.3089 | 0.0009 |
| [≥100K] | −0.1850 | 0.0331 | 8060.059 | −5.5947 | <0.0001 |
| Parental Marital Status (Yes) | −0.1316 | 0.0248 | 8002.610 | −5.3109 | <0.0001 |