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Table 1 Characteristics of study population (n = 3840)

From: Effective factors on Sharp Score in patients with rheumatoid arthritis: a retrospective study

Quantitative Variables Mean Standard Deviation
Age (years) 56.95 12.68
Symptom duration (years) 3.45 1.09
Disease duration (years) 6.92 1.20
BMI (Kg/m2) 22.80 4.51
Tender joint count, 0–28 10.73 5.63
  Subjects Percentage
Sharp score
 ≤ 0 score 111 2.89
 > 0 score, ≤ 50 score 2674 69.64
 > 50 score 1055 27.47
Gender
 Male 666 17.34
 Female 3174 82.66
Ever smoker 458 11.93
Ever drinker 582 15.16
RF positivity 3001 78.15
CCP positivity 3636 94.68
Presence of radiographic erosions 2162 56.32
Prednisolone use 2150 55.98
DMARD treatment (at baseline)
 DMARD-naive 3017 78.56
 MTX monotherapy 1368 35.62
 Non-MTX csDMARD 888 23.13
 Combination csDMARD 905 23.56
Education status
 None or primary 1545 40.23
 Secondary or vocational 1740 45.31
 Tertiary 555 14.45
Housing status
 Private housing 2397 62.42
 Government housing 1443 37.58
Employment status
 Currently employed 1735 45.18
 Unemployment, retired or homemaker 2105 54.82
Marital status
 Currently married 3657 95.23
 Single, divorced or widowed 183 4.77
  Interquartile range (IQR)
Sharp score 20.00 (7.00, 56.00)
DAS28 score 5.50 (4.00, 7.28)
ESR (mm/h) 42.00 (22.00, 68.00)
CRP (mg/L) 15.82 (3.61, 41.49)
RF (U/ml) 79.15 (19.90, 195.05)
CCP (U/ml) 132.98 (25.00, 402.67)
IGA (g/L) 2.47 (1.87, 3.27)
IGG (g/L) 13.45 (11.00, 16.40)
IGM (g/L) 1.35 (0.91, 1.68)
C3 (g/L) 112.45 (96.50, 129.30)
C4 (g/L) 24.7 (19.20, 30.80)
BALP (ng/ml) 660.13 (431.37, 851.60)
BGP (ng/ml) 3479.49 (2871.84, 4825.99)
OPG (ng/ml) 117.20 (948.12, 1338.62)
RANKL (ng/ml) 1085.40 (955.51, 1322.46)
  1. Demographic and clinical variables of all participants were presented in mean (standard deviation), percentage or median (interquartile range)