Table 1 Description of the ORS

ORS 0: Alert

 Blink: normal

 Yawn: no

 Body position: sitting still

 Body movements: normal

ORS 1: Sleepy, no effort to stay awake

 Blink: sporadic periods of long eyelid closure (followed by increased level of blink frequency)

 Yawn: some

 Body position: some situations with changing position – e.g. stretching

 Body movements: some – arms, legs, scratching, rubbing eyes

ORS 2: Very sleepy, great effort to keep awake

 Blink: half-closed eyes, empty gaze

 Yawn: yes

 Body position: yes - change often, stretch, slumped, hanging

 Body movements: yes - e.g. head nodding