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Table 1 Definition of disability by severity

From: The effect of smoking on the duration of life with and without disability, Belgium 1997–2011

   Mild disability Severe disability
Activity of Daily Living (ADL) Transfer in and out bed Ability to do the task on his/her own with difficulties Only able to do the task with personal assistance
Transfer in and out chair
Dressing
Washing of hands and face
Feeding
Going to the toilet
Mobility   Ability to walk less than 200 metres without stopping Ability to walk only a few steps or less without stopping
Continence   Loss of bladder control less than once a month Loss of bladder control at least once a month
Sensorial functions Vision Inability, even with glasses, to recognise a friend at a distance of 4 metres Inability, even with glasses, to recognise a friend at a distance of 1 metre
Hearing Inability, even with a hearing aid, to follow a TV program at a volume others find acceptable Inability, even with a hearing aid, to follow a TV program at a volume others find unacceptable