Table 6. Construct validity—Indices of everyday functioning in b- and i-ADL.

	HC	MCI	AD	Post- hoc P-value a
	(n = 79)	(n = 73)	(n = 71)	HC < MCI	MCI < AD	HC < AD
i-ADL-DI, %				<0.001	<0.001	<0.001
Mean (±SD)	11.2% (±11.6)	36.8% (±22.3)	55.6% (±20.7)
Range	0.0–79.1	0.0–94.4	5.5–100
i-ADL-CDI, %				<0.001	<0.001	<0.001
Mean (±SD)	1.3% (±4.7)	19.3% (±18.6)	43.2% (±21.9)
Range	0.0–38.5	0.0–94.4	2.7–93.7
i-ADL-PDI, %				0.393	1.000	0.146
Mean (±SD)	6.1% (±10.7)	17.2% (±16.5)	20.7% (±19.6)
Range	0.0–79.1	0.0–64.8	0.0–83.3
b-ADL-DI, %				0.031	0.011	<0.001
Mean (±SD)	2.0% (±4.8)	10.9% (±12.9)	17.5% (±15.8)
Range	0.0–25.0	0.0–55.0	0.0–75.0
b-ADL-CDI, %				0.119	<0.001	<0.001
Mean (±SD)	0% (±0.0)	2.1% (±5.8)	6.3% (±9.3)
Range	0.0–0.0	0.0–29.1	0.0–46.8
b-ADL-PDI, %				0.263	0.518	0.016
Mean (±SD)	1.9% (±4.5)	9.1% (±11.0)	12.6% (±15.1)
Range	0.0–25.0	0.0–40.0	0.0–75.1

HC: healthy comparison; MCI: mild cognitive impairment; AD: Alzheimer disease; i-ADL-DI: instrumental Activities of Daily Living—Disability Index; i-ADL-CDI: instrumental Activities of Daily Living—Cognitive Disability Index; i-ADL-PDI: instrumental Activities of Daily Living—Physical Disability Index; b-ADL-DI: basic Activities of Daily Living—Disability Index; b-ADL-CDI: basic Activities of Daily Living—Cognitive Disability Index; b-ADL-PDI: basic Activities of Daily Living—Physical Disability Index; SD: standard deviation.

^a Differences between groups were evaluated by one-way ANCOVA with Bonferonni post hoc test.