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Table 1 Patient demographics and clinical history

From: Characterization of osteoarthritic human knees indicates potential sex differences

Variable

Female

Male

p valuea

Median age (IQR) - years

70 (68, 71)

69 (66, 72)

0.42

Median body mass index (IQR) - kg/m2

26.2 (25.6, 28.1)

27.0 (24.3, 28.6)

0.34

Vitamin D use - no. (%)b

  

0.14

 Currently

6 (60 %)

3 (30 %)

 

 Previously

3 (30 %)

2 (20 %)

 

 Never

1 (10 %)

5 (50 %)

 

Median 25-hydroxy D3 (IQR) - ng/ml

42.1 (33.7, 47.2)

38.4 (31.0, 52.6)

0.79

Bisphosphonates use - no. (%)b

  

0.47

 Previously

2 (20 %)

0 (0 %)

 

 Never

8 (80 %)

10 (100 %)

 

Estrogen use - no. (%)b

  

<0.001

 Currently

4 (40 %)

0 (0 %)

 

 Previously

4 (40 %)

0 (0 %)

 

 Never

2 (20 %)

10 (100 %)

 

Previously injured a knee so badly it was difficult to walk for at least a week - no. (%)

0 (0 %)

3 (30 %)

0.21

Prior knee surgery - no. (%)

6 (60 %)

6 (60 %)

1.00

Prior intra-articular injections of steroids - no. (%)

7 (70 %)

5 (50 %)

0.65

Median no. of steroid injections (IQR)

1 (0, 1)c

1 (0, 3)

0.58

Prior intra-articular injection of hyaluronic acid - no. (%)

3 (30 %)

5 (50 %)

0.65

Median no. of hyaluronic injections (IQR)

0 (0, 1)

2 (0, 3)

0.30

Knee to be replaced - no. (%)

  

1.00

 Right

6 (60 %)

6 (60 %)

 

 Left

4 (40 %)

4 (40 %)

 
  1. IQR interquartile range
  2. a p values result from a Wilcoxon rank sum test for numerical variables and Fisher’s exact test for categorical variables
  3. b p values are based on categorization as currently or previously used vs. never used
  4. cInformation was not available for 1 patient