Table 1 Baseline characteristics of the patients (n = 191)^a

Gender

Male

51 (26.70)

Female

140 (73.30)

Age, y

45.06 ± 3.32

Ethnic group

Han

182 (95.29)

Hui

8 (4.19)

Other

1 (0.52)

Marital status

Married

168 (87.96)

Other

23 (12.04)

Education

 ≤ Junior middle school (9 y)

82 (42.93)

Senior middle school (12 y)

41 (21.47)

 ≥ College (15 y)

68 (35.60)

Residence

Rural

95 (49.74)

Urban

96 (50.26)

Income/month^b

 < 1000 yuan

45 (23.56)

1000–3000 yuan

94 (49.21)

 > 3000 yuan

52 (27.23)

Occupation

Unemployed

76 (39.79)

Blue collar

39 (20.42)

White collar

76 (39.79)

Disease duration, y

5.73 ± 7.33

DAS28

3.58 ± 1.32