Table 3. Class distributions at each level.

Level	Class	Number of instances
1	Immobile	12841
1	Mobile	17607
2	Stand	4072
2	Sit	2756
3	Stand	8649
3	Sit	2808
3	Lie	1353
4	Large Movements	16720
4	Stairs	887
5	Large Movements	15262
5	Stairs up	582
5	Stairs down	458
5	Ramp up	438
5	Ramp down	346
6	Small moves	4577
6	None	8233