Table 2

 Effects of sex, disease duration, and age on the differences between DAS28-ESR and DAS28-CRP

n (%)DAS28-ESRDAS28-CRPDifference (z)
CRP, C-reactive protein; ESR, erythrocyte sedimentation rate.
*Mean [SD].
†Differences in the mean values between DAS28-ESR and DAS28-CRP in women were statistically larger than those in men (p < 0.0001)
x, Disease duration; y, age; z, difference between DAS28-ESR and DAS28-CRP.
Women: z  =  0.0024x + 0.718 (R2  =  0.004, p  =  0.002), z  =  0.0041y + 0.502 (R2  =  0.013, p < 0.001).
Men: z  =  0.0059x + 0.456 (R2  =  0.013, p  =  0.01), z  =  0.0141y – 0.369 (R2  =  0.100, p < 0.001).
Sex
    Women2583 (84.1)4.36 [1.31]*3.61 [1.26]0.75**
    Men490 (15.9)4.02 [1.41]3.50 [1.25]0.52
Disease duration (x) (years, women)
    0∼2306 (11.8)4.22 [1.42]3.50 [1.37]0.72
    3∼5385 (14.9)4.14 [1.31]3.41 [1.26]0.73
    6∼10469 (18.2)4.29 [1.26]3.57 [1.20]0.72
    11∼15441 (17.1)4.54 [1.34]3.79 [1.26]0.75
    16∼20336 (13.0)4.42 [1.24]3.64 [1.20]0.78
    21∼25246 (9.5)4.43 [1.24]3.63 [1.24]0.80
    26∼?400 (15.5)4.49 [1.27]3.69 [1.24]0.80
Disease duration (x) (years, men)
    0∼2104 (21.2)4.09 [1.42]3.59 [1.28]0.50
    3∼579 (16.1)3.70 [1.57]3.34 [1.30]0.36
    6∼10118 (24.1)3.94 [1.32]3.42 [1.13]0.52
    11∼1566 (13.4)4.22 [1.49]3.67 [1.43]0.55
    16∼2040 (8.2)4.39 [1.35]3.74 [1.24]0.65
    21∼2540 (8.2)3.84 [1.27]3.23 [1.15]0.61
    26∼?43 (8.8)4.20 [1.31]3.59 [1.18]0.61
Age (y) (years, women)
    ∼40159 (6.2)4.16 [1.41]3.56 [1.31]0.60
    41∼50228 (8.8)4.26 [1.37]3.55 [1.28]0.71
    51∼60780 (30.2)4.32 [1.29]3.56 [1.25]0.76
    61∼70911 (35.3)4.41 [1.30]3.64 [1.25]0.77
    71∼80443 (17.2)4.47 [1.26]3.68 [1.23]0.79
    81∼?62 (2.4)4.39 [1.23]3.57 [1.17]0.82
Age (y) (years, men)
    ∼4023 (4.7)3.39 [1.63]3.38 [1.24]0.01
    41∼5038 (7.8)3.79 [1.43]3.41 [1.21]0.38
    51∼60118 (24.1)4.05 [1.33]3.63 [1.13]0.42
    61∼70171 (34.9)4.01 [1.46]3.44 [1.32]0.57
    71∼80127 (25.9)4.26 [1.34]3.60 [1.25]0.66
    81∼13 (2.7)3.38 [1.25]2.71 [1.30]0.67