The development of a questionnaire to assess leisure time screen-based media use and its proximal correlates in children (SCREENS-Q)

Table 2 Construct validity (question 9 measured against question13 (n = 243))

Construct validity Comparing time (minutes) obtained by question 9 to time obtained by question 13 (at the same timepoint)	Spearman’s correlation: Rho (95%CI)
On a typical weekday	0.63 (0.54–0.72)
On a typical weekend-day	0.59 (0.49–0.69)
Time summed for a whole week^a	0.66 (0.57–0.75)
Mean time/day^b	0.66 (0.57–0.75)

p-value for all correlations < 0.0001
^a (minutes on a typical weekday × 5) + (minutes on a typical weekend day × 2)
^b ((minutes on a typical weekday × 5) + (minutes on a typical weekend day × 2)/7)

ISSN: 1471-2458