Table 1 Sociodemographic, screen time, and alcohol expectancies characteristics of Adolescent Brain Cognitive Development (ABCD) Study participants (N = 9,008) at Year 2 assessment 2016–2018

Age (years)

12.02 (0.66)

Sex (%)

  Female

48.67

  Male

51.33

Sexual minority (%)

  No

87.65

  Yes

4.45

  Questioning (Maybe)

3.77

  Don’t understand the question

2.99

  Declined to answer

1.14

Race/ethnicity (%)

  White

57.36

  Latino / Hispanic

18.74

  Black

14.44

  Asian

5.18

  Native American

3.04

  Other

1.23

Household income (%)

  Less than $75,000

45.92

  $75,000 and greater

54.08

Parents’ highest education (%)

  High school education or less

13.43

  College education or more

86.57

Parents’ marital status (%)

  Married/partnered

71.87

  Not married/unpartnered/single

28.13

Social media

Social media time (hours per day)

0.71 (1.62)

Social Media Addiction Questionnaire Score^a

1.84 (0.90)

Alcohol Expectancies

Positive

2.99 (0.61)

Negative

2.80 (0.78)