402Arousal and sleep disorders include disorders related to:

402     Arousal and sleep disorders include disorders related to:

a)      initiating and maintaining sleep, or inability to sleep;

b)      excessive somnolence, including sleep-induced respiratory impairment; and

c)       sleep-wake schedules.

403     Central sleep apnoea should be assessed using Table 12.1.3: Sleep and arousal disorders. Obstructive sleep apnoea should be assessed using Table 2.4: WPI derived from obstructive sleep apnoea score (see Chapter 2 – The respiratory system).

Table 12.1.3: Sleep and arousal disorders

See notes to Table 12.1.3 for further information.

| 10 | Reduced daytime alertness placing some restrictions on activities of daily living, performance of which might constitute a risk to the employee. | | 20 | Reduced daytime alertness placing many restrictions on activities of daily living and constituting a risk to the employee. | | 40 | Reduced daytime alertness of such severity that it limits activities of daily living to those that are supervised or protected. | | 60 | Severe reduction in daytime alertness which totally restricts the employee’s daily activities.<br>Full time care and supervision are required. |

Notes to Table 12.1.3

1. ‘Supervision’ means the immediate presence of a suitable person, responsible in whole or in part for the care of the employee.

12.2   Impairment of memory, learning, abstract reasoning and problem solving ability

404     WPI ratings in Table 12.2: Impairment of memory, learning, abstract reasoning and problem-solving ability reflect increasing levels of severity. To satisfy particular WPI rating requirements, the majority of criteria for each WPI rating should be present, as described in Figure 12-B: Clinical dementia rating (CDR).

405     The WPI ratings are incremental. In order to satisfy the criteria for a particular degree of impairment, the employee must have a greater degree of impairment than that described for the preceding levels.

406     The clinical dementia rating (CDR) test for memory, abstract reasoning and problem solving (Figure 12-B) should be administered by a professional competent in the area.

407     The employee’s cognitive function for each category (memory, orientation, judgement and problem solving, community affairs, home and hobbies, personal care) is scored independently. For the purposes of assessing impairment, memory is considered the primary category. The other categories are secondary.