Skip to main content

Table 1 Demographic and desease characteristics of the patients included in NinJa database

From: Clinical characteristics of rheumatoid arthritis patients undergoing cervical spine surgery: an analysis of National Database of Rheumatic Diseases in Japan

Fiscal year

2003

2004

2005

2006

2007

2008

2009

2010

2011

p-value

Coefficient

Total number of registered patients

4100

3994

4650

5152

5463

6502

7179

7254

10368

  

Age (years) (IQR)

62(55–69)

63(55–70)

64(56–71)

63(56–71)

64(56–71)

64(56–71)

64(56–72)

65(57–72)

65(56–72)

<0.0001

 

Gender (female:male)

3410:700

3313:681

3832:818

4229:923

4448:1015

5346:1156

5895:1284

5921:1333

8375:1993

0.7341

 

Disease dutaion (years) (IQR)

11(5–20)

11(5–19)

10(5–19)

10(5–19)

9(4–19)

10(5–19)

10(5–19)

10(5–19)

9(4–18)

0.0020

 

Use of MTX (%)

36

48

53

53

47

51

64

58

60

0.0084

2.43

Use of corticosteroid (%)

64

63

62

63

61

58

53

53

49

0.0002

-1.88

Use of biologics (%)

0.4

2.1

4.3

9

12

14

20

19

20

<0.0001

2.76

Cervical spine surgery (cases) (%)

8 (0.19)

7 (0.17)

4 (0.08)

6 (0.12)

8 (0.15)

10 (0.15)

10 (0.14)

15 (0.21)

30 (0.29)

0.1593

0.01

Total knee replacement (cases) (%)

146 (3.55)

121 (3.02)

117 (2.52)

130 (2.52)

132 (2.42)

118 (1.81)

156 (2.17)

133 (1.87)

158 (1.52)

0.0002

-0.21

Total hip replacement (cases) (%)

33 (0.80)

37 (0.93)

50 (1.08)

48 (0.93)

45 (0.82)

51 (0.78)

46 (0.64)

43 (0.59)

56 (0.54)

0.0098

-0.05

  1. The data are represented as the medians (IQR). The yearly differences were analyzed by the Tukey-Kramer method.
  2. Yearly trends were analyzed by a single regression model, and are expressed by coefficients and p-values.