# Table 3 Factors related to willingness to participate: multivariate analysis

Â

Model 1*

Model 2+

Model 3++

Â

Bivariate analysis

Multivariate analysis

Multivariate analysis

Multivariate analysis

Â Â

Pseudo R2â€‰=â€‰0.20

Pseudo R2â€‰=â€‰0.25

Pseudo R2â€‰=â€‰0.36

Â

O.R. (95% C.I.)

p-value

A.O.R. (95% C.I.)

p-value

A.O.R. (95% C.I.)

p-value

A.O.R. (95% C.I.)

p-value

Age

Â Â Â Â Â Â Â Â

â€ƒâ€‰â‰¤55

1

Â

1

Â Â Â Â Â

â€ƒâ€‰56-65

0.67 (0.37-1.21)

0.18

0.77 (0.38-1.58)

0.48

Â Â Â Â

â€ƒâ€‰>65

0.44 (0.24-0.83)

0.011

0.85 (0.40-1.83)

0.68

Â Â Â Â

Education

Â Â Â Â Â Â Â Â

â€ƒâ€‰High school or less

1

Â

1

Â Â Â

1

Â

â€ƒâ€‰College

4.18 (2.26-7.73)

<0.001

4.07 (1.97-8.42)

<0.001

Â Â

4.24 (1.77-10.17)

0.001

1.93 (1.12-3.31)

0.018

1.86 (0.97-3.56)

0.062

Â Â

1.27 (0.62-2.61)

0.51

Â Â Â Â Â Â Â Â

â€ƒâ€‰No

1

Â

1

Â Â Â

1

Â

â€ƒâ€‰Yes

1.79 (1.10-2.89)

0.017

2.09 (1.16-3.76)

0.014

Â Â

2.72 (1.39-5.32)

0.004

CAM use

Â Â Â Â Â Â Â Â

â€ƒâ€‰No

1

Â

1

Â Â Â Â Â

â€ƒâ€‰Yes

2.36 (1.46-3.82)

<0.001

1.26 (0.71-2.24)

0.43

Â Â Â Â

Joint pain during past 7 days

Â Â Â Â Â Â Â Â

â€ƒâ€‰None

1

Â

1

Â Â Â

1

Â

â€ƒâ€‰Mild/moderate

1.98 (1.06-3.71)

0.032

2.06 (0.96-4.44)

0.064

Â Â

1.48 (0.61-3.57)

0.38

â€ƒâ€‰Severe or more

2.60 (1.19-5.67)

0.017

3.49 (1.34-9.04)

0.01

Â Â

2.77 (0.89-8.59)

0.078

Co-morbidity

Â Â Â Â Â Â Â Â

â€ƒâ€‰No

1

Â

1

Â Â Â Â Â

â€ƒâ€‰Yes

0.58 (0.35-0.97)

0.038

0.65 (0.34-1.23)

0.19

Â Â Â Â

Acupuncture expectancy scale

1.19 (1.12-1.26)

<0.001

1.20 (1.12-1.28)

<0.001

Â Â

1.17 (1.08-1.26)

<0.001

Travel difficulty

Â Â Â Â Â Â Â Â

â€ƒâ€‰Disagree

1

Â Â Â

1

Â

1

Â

â€ƒâ€‰Agree

0.27 (0.16-0.44)

<0.001

Â Â

0.41 (0.23-0.75)

0.003

0.36 (0.19-0.68)

0.002

Concern with experimentation

Â Â Â Â Â Â Â Â

â€ƒâ€‰Disagree

1

Â Â Â

1

Â

1

Â

â€ƒâ€‰Agree

0.13 (0.069-0.26)

<0.001

Â Â

0.34 (0.14-0.81)

0.015

0.31 (0.13-0.78)

0.013

Don't want placebo

Â Â Â Â Â Â Â Â

â€ƒâ€‰Disagree

1

Â Â Â

1

Â Â Â

â€ƒâ€‰Agree

0.40 (0.24-0.64)

<0.001

Â Â

0.96 (0.50-1.83)

0.90

Â Â

Demanding job

Â Â Â Â Â Â Â Â

â€ƒâ€‰Disagree

1

Â Â Â

1

Â Â Â

â€ƒâ€‰Agree

0.73 (0.45-1.18)

0.196

Â Â

1.10 (0.58-2.09)

0.77

Â Â

Home responsibilities

Â Â Â Â Â Â Â Â

â€ƒâ€‰Disagree

1

Â Â Â

1

Â Â Â

â€ƒâ€‰Agree

0.39 (0.24-0.62)

<0.001

Â Â

0.77 (0.41-1.42)

0.40

Â Â

Not interested in acupuncture

Â Â Â Â Â Â Â Â

â€ƒâ€‰Disagree

1

Â Â Â

1

Â Â Â

â€ƒâ€‰Agree

0.051(0.022-0.12)

<0.001

Â Â

0.098 (0.040-0.24)

<0.001

0.12 (0.043-0.35)

<0.001

1. *Model 1: Multivariate analysis on sociodemographic and clinical factors related to willingness to participate.
2. +Model 2: Multivariate analysis on barriers related to willingness to participate.
3. ++Model 3: Multivariate analysis on factors significant in Model 2 and 3 related to willingness to participate.