Osteoporosis, osteopenia and normal bone mineral density (BMD) among patients with psoriatic arthritis and controls in the HUNT 3 study: Ordinal regression shows higher odds of being classified as having osteopenia or osteoporosis for the control group
| Based on T-score femoral neck | PsAoriatic Arthritis | Controls | Overall p- vValue* | Overall p -vValue **† |
|---|---|---|---|---|
| Osteoporosis | 1 (1.4) | 739 (6.4) | 0.002 | 0.001 |
| Osteopenia | 15 (21.7) | 4065 (35.4) | ||
| Normal BMD | 53 (76.8) | 6690 (58.2) | ||
| Based on T-score total hip | ||||
| Osteoporosis | 1 (1.4) | 474 (4.1) | 0.024 | 0.033 |
| Osteopenia | 12 (17.4) | 3143 (27.5) | ||
| Normal BMD | 56 (81.2) | 7824 (68.4) | ||
| Based on T-score spine L1–L4 | ||||
| Osteoporosis | 3 (4.4) | 903 (7.8) | 0.021 | 0.033 |
| Osteopenia | 11 (16.2) | 3065 (26.4) | ||
| Normal BMD | 54 (79.4) | 7629 (65.8) | ||
Frequency (percentage).
*Ordinal regression with no adjustments made,
† Ordinal regression with adjustments made for age (continuous), BMI, physical activity, smoking, asthma/COPD and reason for invitation to DXA (randomly or based on self-reported pulmonary symptoms).
BMD, bone mineral density; BMI, body mass index; COPD, chronic obstructive pulmonary disease; DXA, dual-energyX-ray absorptiometry; HUNT, Nord-Trøndelag Health Study; PsA, psoriatic arthritis.