Table 1. Paw pressure visual rating scale in rats filmed in observation chambers.

Score	Criteria
0	Normal paw pressure, equal weight on both hind paws
0.5	Normal paw pressure, paw is completely on the floor but toes are unequal to control hind paw
1	Slightly reduced paw pressure, paw is completely on the floor but toes are not spread
1.5	Reduced paw pressure, intermediate between category 1 and 2
2	Moderately reduced paw pressure, paw curled with only some parts of the hind paw lightly touching the floor
2.5	Moderately reduced paw pressure, paw curled with toes only lightly and occasionally touching the floor
3	Severely reduced paw pressure, paw completely elevated