||Only one side of body affected (e.g. tremor in one limb), usually with minimal or no functional impairment.
||Both sides of the body or the midline is affected, but posture and balance remain normal.
||Impaired righting reflexes affecting both sides of the body characterized by a mild to moderate disabling imbalance when standing, turning or walking. The patient remains independent.
||Severe disabling disease is present. Yet, the person can still stand and walk unaided. The patient usually requires help with activities of daily living.
||The person is often restricted to a bed or a wheelchair unless aided.