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Table 3 Relative risk ratios (95% confidence intervals) for activity impairment trajectory class membership from multinomial logit model and the relative importance in predicting trajectory class membership from dominance analysis

From: Digital self-management of hip and knee osteoarthritis and trajectories of work and activity impairments

Variable

L–D vs. VH–P

M–D vs. VH–P

H–D vs. VH–P

VH–SD vs. VH–P

Dominance statisticsa

Rankingb

Female sex (male = ref)

1.65 (1.37, 1.99)

1.39 (1.20, 1.61)

1.15 (1.00, 1.32)

1.20 (0.96, 1.51)

0.0004

12

Age (24–50 years = ref)

1.00

1.00

1.00

1.00

0.0008

9

 51–65 years

0.90 (0.67, 1.23)

0.99 (0.77, 1.27)

0.97 (0.77, 1.22)

0.87 (0.60, 1.24)

 66–74 years

0.99 (0.67, 1.45)

1.08 (0.79, 1.47)

0.94 (0.71, 1.26)

0.76 (0.48, 1.20)

 75 + years

0.69 (0.44, 1.07)

0.90 (0.63, 1.27)

0.94 (0.68, 1.30)

0.51 (0.30, 0.87)

Hip as index joint (knee = ref)

1.03 (0.88, 1.20)

0.90 (0.80, 1.02)

0.83 (0.74, 0.93)

0.50 (0.41, 0.61)

0.0015

8

Education (Less than high school = ref)

1.00

1.00

1.00

1.00

0.0016

7

 High school

1.23 (0.89, 1.71)

0.99 (0.79, 1.23)

0.97 (0.79, 1.19)

1.11 (0.77, 1.60)

 College/university

1.21 (0.88, 1.66)

0.98 (0.79, 1.22)

0.98 (0.80, 1.20)

1.38 (0.97, 1.98)

Employment (Working = ref)

1.00

1.00

1.00

1.00

0.0033

6

 Not working

0.32 (0.21, 0.48)

0.42 (0.32, 0.55)

0.67 (0.53, 0.84)

0.65 (0.43, 0.97)

 Retired

0.44 (0.34, 0.57)

0.59 (0.49, 0.73)

0.85 (0.71, 1.02)

0.94 (0.70, 1.26)

Body mass index (< 25 = ref)

1.00

1.00

1.00

1.00

0.0083

3

 25–29

0.72 (0.60, 0.87)

0.83 (0.71, 0.97)

0.96 (0.83, 1.12)

0.72 (0.58, 0.89)

 30–34

0.56 (0.44, 0.72)

0.64 (0.53, 0.77)

0.87 (0.73, 1.04)

0.44 (0.33, 0.60)

 35 + 

0.24 (0.16, 0.36)

0.36 (0.28, 0.46)

0.64 (0.52, 0.79)

0.37 (0.25, 0.55)

Diabetes

1.53 (1.06, 2.22)

1.30 (1.00, 1.68)

1.04 (0.82, 1.31)

0.96 (0.61, 1.50)

0.0003

14

Lung diseases

1.61 (1.22, 2.13)

1.42 (1.15, 1.76)

1.23 (1.01, 1.50)

1.37 (0.99, 1.90)

0.0003

13

Balance troubles

1.01 (0.60, 1.69)

1.13 (0.81, 1.56)

1.05 (0.79, 1.39)

0.79 (0.44, 1.43)

0.0004

11

Rheumatoid arthritis

0.80 (0.53, 1.21)

0.86 (0.65, 1.14)

0.91 (0.71, 1.18)

0.73 (0.45, 1.19)

0.0005

10

Cardiovascular diseases

1.12 (0.80, 1.55)

1.10 (0.87, 1.39)

1.01 (0.82, 1.25)

1.10 (0.76, 1.59)

0.0003

15

Walking difficulties

0.24 (0.17, 0.35)

0.43 (0.35, 0.54)

0.65 (0.54, 0.79)

0.56 (0.39, 0.80)

0.0054

4

General health

1.62 (1.54, 1.70)

1.29 (1.25, 1.34)

1.10 (1.06, 1.13)

1.24 (1.18, 1.31)

0.0177

2

Pain

0.28 (0.26, 0.29)

0.40 (0.38, 0.42)

0.65 (0.62, 0.68)

0.72 (0.68, 0.77)

0.1127

1

Physical function

1.06 (1.04, 1.08)

1.05 (1.03, 1.06)

1.03 (1.01, 1.04)

1.03 (1.00, 1.05)

0.0050

5

McFadden pseudo-R2

0.159

  

MCC

0.264

  

CEN

0.462

  

PDI

0.435

  
  1. CEN Confusion entropy, H–D High–declining, L–D Low–declining, MCC Matthews correlation coefficient, M–D Moderate–declining, PDI Polytomous discrimination index, VH–P Very high–persistent, VH–SD Very high–substantially declining
  2. aEach variable absolute contribution to McFadden pseudo-R2
  3. bThe relative importance of each variable in predicting trajectory class membership
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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