Table 2

Criteria for disability: established methods

Northern criteriaVictorian criteriaMersey criteria
Severe disability Cerebral palsy severe enough to hamper age appropriate activity Severe disability Cerebral palsy—unlikely to walk Severe disability For example:
Deafness warranting a hearing aidBilateral blindnessSpastic quadriplegia
Blindness or partial sightDevelopmental index 3SD or more below the meanBlindness
Developmental quotient <70Deafness
Epilepsy uncontrolled by drugsEpilepsy—uncontrolled
Permanent stomaDevelopmental quotient <50
Multiple disabilities
Impairment without disability Mild cerebral palsy Moderate disability Cerebral palsy—non-ambulant but likely to walk Moderate disability For example:
Developmental quotient 70–79Sensorineural deafness requiring amplificationSpastic diplegia or hemiplegia
Developmental quotient 50–69
Minor impairment Squint Mild disability Cerebral palsy—ambulant Mild disability For example:
Growth retardation after bowel resectionDevelopmental index between 1SD and 2SD below the meanMyopia, language delay, mild hearing loss, hyperactivity, motor clumsiness
Speech delay with hearing loss
Normal None of the above Normal None of the above Normal None of the above