Table 2 Known Groups Validity of Lawton IADL Scale According to relevant categories

Total

1903

5.56 (2.84)

903

4.32 (2.95)

1000

6.68 (2.22)

Age

≤75^a

582

7.18 (1.82)^b,c

118

6.25 (2.60)^b,c

464

7.42 (1.48)^b,c

76-85^b

823

5.58 (2.77)^a,c

395

4.64 (2.90)^a,c

428

6.45 (2.34)^a,c

>85^c

498

3.63 (2.75)^a,b

390

3.41 (2.75)^a,b

108

4.43 (2.62)^a,b

p-value

<0.0001

<0.0001

<0.0001

Barthel Index

≤35^a

65

0.42 (0.56)^c

52

0.35 (0.48)^c

13

0.69 (0.75)^b,c

40-55^b

99

1.36 (1.61)^c

80

1.08 (1.21)^c

19

2.58 (2.39)^a,c

≥60^c

1714

6.00 (2.54)^a,b

758

4.94 (2.72)^a,b

956

6.84 (2.03)^a,b

p-value

<0.0001

<0.0001

<0.0001

SF-12 PCS scale

<50

1229

4.71 (2.91)

714

3.86 (2.84)

515

5.89 (2.57)

≥50

601

7.43 (1.41)

149

6.83 (2.01)

452

7.63 (1.09)

p-value

<0.0001

<0.0001

<0.0001

WOMAC-SF Function Subscale

[0–25]^a

-

-

351

6.44 (2.16)^b,c

-

-

(25–50]^b

-

-

261

3.99 (2.59)^a,c

-

-

(50–100]^c

-

-

300

2.18 (2.30)^a,b

-

-

p-value

-

<0.0001

-

QuickDASH

[0–25]^a

-

-

-

-

855

7.09 (1.79)^b,c

(25–50]^b

-

-

-

-

98

4.71 (2.77)^a,c

(50–100]^c

-

-

-

-

41

2.88 (2.58)^a,b

p-value

-

-

<0.0001