Table 3

Unadjusted association of income with pain, activity limitation and improvement in knee function after primary total knee arthroplasty

2 years

5 years


Odds ratio (95% CI)

P value

Odds ratio (95% CI)

P value

Odds ratio (95% CI)

P value

Odds ratio (95% CI)

P value


Pain/function:

Moderate to severe pain

Moderate to severe functional limitation

Moderate to severe pain

Moderate to severe functional limitation

≤ US$35, 000

0.68 (0.50 to 0.92)

0.01

0.82 (0.67 to 0.99)

0.04

0.86 (0.60 to 1.22)

0.39

0.92 (0.74 to 1.15)

0.47

> US$35, 000 to US$45, 000

0.80 (0.64 to 1.01)

0.06

0.99 (0.85 to 1.15)

0.90

0.90 (0.65 to 1.25)

0.55

1.00 (0.82 to 1.23)

0.99

> US$45, 000 (ref)

1.00

1.00

1.00

1.00

Improvement:

Better

Much better

Better

Much better

≤ US$35, 000

1.5 (0.9 to 2.4)

0.13

1.1 (0.7, 1.7)

0.61

1.2 (0.7 to 2.0)

0.57

1.2 (0.8 to 1.9)

0.39

> US$35, 000 to US$45, 000

1.1 (0.7 to 1.6)

0.72

1.0 (0.7 to 1.5)

0.83

1.1 (0.7 to 1.7)

0.78

1.1 (0.8, 1.7)

0.56

> US$45, 000 (ref)

1.00

1.00

1.00

1.00


Singh and Lewallen BMC Medicine 2013 11:62   doi:10.1186/1741-7015-11-62

Open Data