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Table 3 Results of R/LKOAC

From: Contralateral knee osteoarthritis is a risk factor for ipsilateral knee osteoarthritis progressing: a case control study

RKOAC

Primary outcome

mJSW

(Median (upper-lower quartile))

Exposure

Control

Z/P-value

Baseline

3.7(2.5 ~ 5.1)

3.8(2.7 ~ 4.6)

0.5/0.6

Four years

2.6(1.1 ~ 3.6)

3.3(2.0 ~ 4.2)

2.9/<0.05

Secondary outcome

KA rate (baseline-9 years)

98/14(14.3%)

98/4(4.1%)

2.5/<0.05

LKOAC

Primary outcome

mJSW

(Median (upper-lower quartile))

Exposure

Control

Z/P-value

Baseline

3.9(2.9 ~ 4.9)

3.9(3.1 ~ 4.7)

0.3/0.76

Four years

3.1(2 ~ 3.9)

3.4(2.6 ~ 4.2)

2.3/<0.05

Secondary outcome

KA rate (baseline-9 years)

117/16(13.7%)

117/7(6%)

2.0/<0.05

  1. mJSW was balanced at baseline and no significant difference between two groups. After four years, two groups’ mJSW are different and exposure group is lower than control group, the P-value less than 0.05. It means exposure group has higher articular cartilage loss. Besides, higher KA rate also indicates that exposure group’s participants may have more severe progression of KOA.