Table 1 Definitions of moderate and severe impairment

Cognitive

Under 1% of factor 1 OR factor 2 in 296 children with negative response of TQQ

Inability to successfully complete even one cognitive test item

Motor ^a

Difficulty in grip, dressing and sitting. Ability to move around with help.

Inability to walk and absence of functional use of hands

Epilepsy ^a

More than one non-febrile seizure per month

More than one non-febrile seizure per week.

Hearing ^a

At least one positive response in screening tests and 41–70 dB loss in the best ear.

More than 70 dB loss in the best ear

Vision ^a

Visual acuity less than 6/18 or better than 6/60

Visual acuity worse than 6/60 meters or better than 3/60