Table 1 Comparison of model goodness-of-fit and corresponding likelihood ratio test

Physical functional status

 Model 0

2

−40,079

80,158

 Model 1

3

−39,933

79,867

290.900

1

.000^***

 Model 2

9

−39,169

78,338

1528.300

6

.000^***

 Model 3

11

−39,123

78,246

91.860

2

.000^***

 Model 4

13

−39,109

78,218

28.485

2

.000^***

 Model 5

14

−39,105

78,210

8.256

1

.004^**

 Model 6

19

−39,079

78,157

52.573

5

.000^***

 Model 7

21

−39,076

78,153

4.222

2

.121

Depressive symptoms

 Model 0

2

−39,165

78,330

 Model 1

3

−38,652

77,303

1027.120

1

.000^***

 Model 2

9

−38,333

76,666

636.895

6

.000^***

 Model 3

11

−38,239

76,479

187.558

2

.000^***

 Model 4

13

−38,239

76,477

1.313

2

.519

 Model 5

14

−38,224

76,448

29.112

1

.000^***

 Model 6

19

−38,200

76,400

47.904

5

.000^***

 Model 7

21

−38,191

76,382

18.701

2

.000^***

Self-rated health

 Model 0

1

−7348

14,695

 Model 1

2

−7215

14,429

266.016

1

.000^***

 Model 2

8

−7042

14,083

346.010

6

.000^***

 Model 3

10

−6980

13,960

122.719

2

.000^***

 Model 4

12

−6979

13,958

2.408

2

.300

 Model 5

13

−6968

13,936

21.521

1

.000^***

 Model 6

18

−6966

13,933

3.753

5

.586

 Model 7

20

−6961

13,922

10.560

2

.005^**