Fig. 1.

Systemic bone mineral density in relation to disease-related variables. Regression analysis of reduced bone mineral density (Z score ≤ -1) in the spine and the hip. Odds ratios (OR) are presented with corresponding 95 % CI levels. All variables were adjusted for age, gender, menopausal status, body mass index and current smoking. ACR American College of Rheumatology, DAS28 28-joint disease activity score, SJC28 swollen joint count in 28 joints, CRP C-reactive protein, US-PD ultrasonographic power Doppler score, HAQ Health Assessment Questionnaire, SHS Sharp–van der Heijde score, ACPA anti-citrullinated protein antibodies, RF rheumatoid factor