15. Vestergaard 2006 (2008b): fracture and hormonal IUD use.
| Subgroup | Cases (N) | Controls (N) | OR (95% CI)a | |
| Hormonal IUDb use ever | ‐ | 219 | 791 | 0.75 (0.64 to 0.87) |
| Age of woman (years) |
< 25 | 3 | 5 | 0.82 (0.19 to 3.67) |
| 25 to 50 | 187 | 639 | 0.87 (0.73 to 1.04) | |
| > 50 | 29 | 147 | 0.72 (0.48 to 1.09) | |
| IUDs per year |
< 0.25 | 59 | 234 | 0.74 (0.55 to 1.00) |
| 0.26 to 0.6 | 84 | 280 | 0.84 (0.65 to 1.08) | |
| > 0.6 | 76 | 277 | 0.81 (0.62 to 1.05) | |
| Duration of hormonal IUD use (years) |
< 1.5 | 68 | 244 | 0.78 (0.59 to 1.03) |
| 1.6 to 4 | 83 | 289 | 0.77 (0.59 to 0.99) | |
| > 4 | 68 | 258 | 0.77 (0.58 to 1.01) | |
aAdjusted for prior fracture, Charlson index (comorbidities), income, working status, living with someone or not, pregnancy, DMPA use, hysterectomy, alcoholism; use of OC, corticosteroid, hormonal replacement therapy, anti‐epileptic drugs, and strong (morphine and opioid agonists) and weak analgesics (acetaminophen, nonsteroidal anti‐inflammatory drugs, and acetylsalicylic acid) bIUD = intrauterine device