Table 1.

Questionnaires and levels of the Health-related Quality of Life Instrument with 8 Items.

Domains	Items	Levels of Responses
Physical health	Stair Climbing	1. I had no difficulty climbing stairs.
		2. I had some difficulty climbing stairs.
		3. I had a lot of difficulty climbing stairs.
		4. I couldn’t climb stairs.
	Pain	1. I had no pain.
		2. I had mild pain.
		3. I had severe pain.
		4. I had intense pain.
	Vitality	1. I always had energy.
		2. I often had energy.
		3. I sometimes had energy.
		4. I had no energy at all.
Social health	Working	1. I had no difficulty working.
		2. I had some difficulty working.
		3. I had a lot of difficulty working.
		4. I couldn’t work.
Mental health	Depression	1. I was not depressed at all.
		2. I was occasionally depressed.
		3. I was frequently depressed.
		4. I was always depressed.
	Memory	1. I had no difficulty remembering.
		2. I had some difficulty remembering.
		3. I had a lot of difficulty remembering.
		4. I couldn’t remember at all.
	Sleep	1. I had no difficulty sleeping.
		2. I had some difficulty sleeping.
		3. I had a lot of difficulty sleeping.
		4. I couldn’t sleep well.
Positive health	Happiness	1. I was always happy.
		2. I was often happy.
		3. I was occasionally happy.
		4. I was not happy at all.