Table 1.

Characteristics of patients.

Characteristics	Total, n = 101	Low BMI, n = 24	Normal BMI, n = 42	High BMI, n = 35	p, ANOVA^*
Women, n (%)	81 (80.2)	18 (75)	30 (71.4)	33 (93.4)	NS^†
Age, yrs, mean ± SD	41.9 ± 11.9	39.88 ± 13.02	42.95 ± 12.13	42.06 ± 11.23	NS
RA disease duration, mo, mean ± SD	10.77 ± 6.73	13.5 ± 7.6	9.3 ± 5.8	10.6 ± 6.7	NS
IgM-RF-positive, n (%)	55 (54.5)	15 (62.5)	22 (52.4)	18 (51.4)	NS^†
RF, IU/ml	54.44 ± 42.74	57.08 ± 46.67	53.14 ± 39.30	54.17 ± 45.06	NS
BMI, kg/m²	22.82 ± 4.66	16.69 ± 1.16	21.94 ± 1.94	27.90 ± 2.39	NA
SENS, mean ± SD	16.8 ± 11.1	26.62 ± 13.45	16.05 ± 8.34	11.27 ± 7.40	< 0.0005
DAS28, mean ± SD	6.2 ± 0.9	6.62 ± 0.87	6.04 ± 0.93	6.21 ± 1.01	NS

RF: rheumatoid factor; BMI: body mass index; SENS: Simplified Erosion Narrowing Score; DAS28: Disease Activity Score 28-joint count; NS: nonsignificant; NA: not applicable.
↵* Between low, normal, and high BMI groups.
↵† Kruskal-Wallis test.