Table 2.

Shoulder task description.

Task	Subtask	Explanation
Washing Hair (WH)	1	Lift hands toward the top of the head.
	2	Wash hair for a few seconds.
	3	Put down hands and return to the initial position.
Washing Upper Back (WUB)	1	Lift hand toward the neck.
	2	Washing the upper back for a few seconds, including shoulders on both sides and the neck.
	3	Put down the hand and return to the initial position.
Washing Lower Back (WLB)	1	Rotate the hand toward the back.
	2	Wash the lower back for a few seconds, involving the area between the shoulder blade and the waist.
	3	Put down the hand, and return to the start position.
Placing an Object on a High Shelf (POH)	1	Hold a smartphone using the painful/dominant hand in the initial position, then lift the hand to the height approximately above the head.
	2	Holding the phone in the air for a few seconds.
	3	Put down the hand and return to the initial position.
Removing an Object from the Back Pocket (ROP)	1	Hold a smartphone the painful/dominant hand in the initial position, then rotate the hand toward the back pocket.
	2	Put the phone into the pocket, then take it out.
	3	Put down the hand and return to the initial position.