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

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

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 weekday0.63 (0.54–0.72)
On a typical weekend-day0.59 (0.49–0.69)
Time summed for a whole weeka0.66 (0.57–0.75)
Mean time/dayb0.66 (0.57–0.75)
  1. p-value for all correlations < 0.0001
  2. a (minutes on a typical weekday × 5) + (minutes on a typical weekend day × 2)
  3. b ((minutes on a typical weekday × 5) + (minutes on a typical weekend day × 2)/7)
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