Table 4.

Floor and ceiling effects at baseline (week 0) and end of core phase (week 18).

HRQL measure	Floor effects	Ceiling effects
QOLCE	24/92 items (26%) 7 items – ‘Physical restrictions’ 6 items – ‘Language’ 5 items – ‘Attention/concentration’	20/92 items (22%) 4 items – ‘Anxiety’ 4 items – ‘Behavior’
QOLIE-AD-48	4/48 items (8%) 4 items – ‘Attitudes toward epilepsy’	37/48 items (77%) Items were across 8/9 domains, except for the health perception domain.
QOLIE-31-P	3/30 items (10%) 1 item – ‘social function’ 2 items – ‘seizure worry’	27/30 items (90%) Items were across all seven domains