Year 2011-2015 2011-2015
Wave Whole cohort Clinical sub-sample
Age 10-14 years 10-14 years
Sleeping problems S:PedsQL-4.0
S – self report
P – parent report
C – child report
T – teacher report
N – welfare nurse
O – observation
XM: Mother
XF/P: Father/partner
XC: Child
XS: Sibling
XG: Grandparent

PedsQL-4.0: Pediatric Quality of Life Inventory – 4.0 Generic Core Scales