0(0) - No increase in muscle tone
1(1) - Slight increase in muscle tone, with a catch and release or minimal resistance at the end of the range of motion when an affected part(s) is moved in flexion or extension
1+(2) - Slight increase in muscle tone, manifested as a catch, followed by minimal resistance through the remainder (less than half) of the ROM (range of movement)
2(3) - A marked increase in muscle tone throughout most of the range of motion, but affected part(s) are still easily moved
3(4) - Considerable increase in muscle tone, passive movement difficult
4(5) - Affected part(s) rigid in flexion or extension