# Table 3 Test-retest reliability of child- and parent screen time use (N = 31)

Question (measure) assessed
(all units of measurement are minutes)
Statistical assessment of test-retest reliability
Question 9
Time spent using screen media on a typical weekday, (child) ICC = 0.72 (95%CI: 0.52–0.86)
SEM = 38.84 min/day (95% CI: 30.09–50.13)
Mean difference = 2.74
Limits of agreement = (− 105.02, 110.51)
Time spent using screen on a typical weekend-day, (child) ICC = 0.67 (95%CI: 0.47–0.84)
SEM = 59.88 min/day (95% CI: 46.75–76.70)
Mean difference = 18.23
Limits of agreement = (− 146.93, 183.39)
Mean min per day, child (min week-day ×  5) + (min per weekend day ×  2)/7(child) ICC = 0.75 (95% CI 0.58–0.88)
SEM = 38.52 min/day (95% CI 29.94–49.56)
Mean difference = 7.17 min/day
Limits of agreement = (− 99.67, 114.00)
Question 13
Time spent using screen media on a typical weekday, (child) ICC = 0.81 (95%CI: 0 .67–0.90)
SEM = 26.66 min/day (95% CI: 20.81–34.14)
Mean difference = 2.42
Limits of agreement = (− 72.76, 77.60)
Time spent using screen media on a typical weekend-day, (child) ICC = 0.90 (95%CI: 0.81–0.95)
SEM = 47.29 min/day (95% CI: 36.91- = 60.59)
Mean difference = 18.87
Limits of agreement = (− 109.27, 147.01)
Mean min per day, child (min week-day ×  5) + (min per weekend day ×  2)/7(child) ICC 0.88 (95%CI: 0.79–0.94)
SEM = 27.05 min/day (95% CI: 21.11–34.65)
Mean difference = 7.12
Limits of agreement = (− 67.93, 82.16)
question 19
Time spent using screen media on a typical weekday, (parent) ICC = 0.68 (95%CI: 0.48–0.84)
SEM = 60.47 min/day (95% CI: 47.33–77.26)
Mean difference = 10.16
Limits of agreement = (− 160.49, 180.81)
Time spent using screen media on a typical weekend-day, (parent) ICC = 0.80 (95%CI: 0.66–0.90)
SEM = 63.01 min/day (95% CI: 49.22–80.66)
Mean difference = 2.42
Limits of agreement = (− 175.78, 180.62)
Mean min per day, parent (min week-day ×  5) + (min per weekend day ×  2)/7(parent) ICC = 0.75 (95%CI: 0.59–0.88)
SEM = 54.54 min/day (95% CI: 42.65–69.76)
Mean difference = 7.95
Limits of agreement = (− 145.85, 161.75)
question 18
Work-related time spent on screen media on weekdays in the home, (parent) ICC = 0.73 (95%CI: 0.55–0.87.)
SEM = 63.86 min/day (95% CI: 49.70–82.04)
Mean difference = − 3.87
Limits of agreement = (− 182.86, 175.12)
Work-related time spent on screen media on weekend-days in the home, (parent) ICC = 0.69 (95%CI: 0.50–0.84)
SEM = 26.57 min/day (95% CI: 20.76–34.02)
Mean difference = − 5.81
Limits of agreement = (− 80.06, 68.44)
1. ICC Intraclass Correlation Coefficient, SEM Standard Error of Mean, LOA Limits of Agreement, CI confidence interval