Table 2. Mean and standard deviation of each item in the questionnaire for young adults, older adults, and adults with LiD.

Question items	Young adults (n=20)	Older adults (n=20)	Adults with LiD (n=20)	p-value
1	9.20 (±1.00)	8.40 (±2.03)	4.70 (±2.15)	p <0.001**
2	6.95 (±2.28)	7.05 (±1.98)	12.15 (±1.87)	p < 0.001**
3	8.60 (±1.53)	7.10 (±2.22)	3.00 (±1.58)	p < 0.001**
4	9.05 (±1.19)	6.80 (±2.26)	3.05 (±1.43)	p < 0.001**
5	8.40 (±1.18)	6.25 (±2.07)	4.15 (±2.25)	p < 0.001**
6	8.00 (±2.02)	7.40 (±2.08)	5.15 (±3.15)	p < 0.05*
7	7.65 (±1.98)	7.40 (±1.50)	5.85 (±2.71)	n.s.
8	8.75 (±1.16)	7.90 (±1.74)	6.95 (±2.62)	n.s.
9	8.60 (±1.42)	6.30 (±2.63)	4.70 (±2.07)	p < 0.001**
10	7.05 (±2.45)	7.45 (±1.84)	6.65 (±3.03)	n.s.
11	8.70 (±1.45)	8.45 (±1.50)	6.95 (±2.64)	n.s.
12	7.95 (±1.50)	7.30 (±1.92)	3.00 (±2.42)	p < 0.001**