Table 5.
Calculation of weight threshold at which bone densitometry becomes cost-effective for women
| Age (years) | Age- and sex-specific prevalence low BMD (%) | Cost-effective pre-test probability of low BMD (%) | Age- and sex-specific odds low BMD | Threshold odds low BMD | Change in log [Odds] | Odds low BMD per 10 kg increase in weight (log [Odds]) | Weight change from mean to reach threshold weight (kg) | ||
|---|---|---|---|---|---|---|---|---|---|
|
|
|
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| Odds | Log (Odds) | Odds | Log (Odds) | ||||||
| 55 | 0.93 | 1.62 | 0.0094 | −4.671 | 0.0164 | −4.108 | 0.563 | 0.30 (−1.204) | −4.7 |
| 60 | 2.76 | 1.49 | 0.0284 | −3.560 | 0.0151 | −4.192 | −0.632 | 0.33 (−1.109) | 5.7 |
| 65 | 4.42 | 1.23 | 0.0462 | −3.073 | 0.0125 | −4.383 | −1.310 | 0.39 (−0.942) | 13.9 |
| 70 | 8.16 | 1.13 | 0.0888 | −2.421 | 0.0115 | −4.469 | −2.048 | 0.42 (−0.867) | 23.5 |
| 75 | 14.59 | 1.15 | 0.1708 | −1.767 | 0.0116 | −4.453 | −2.396 | 0.42 (−0.867) | 27.5 |
| 80 | 19.21 | 1.23 | 0.2378 | −1.436 | 0.0124 | −4.389 | −2.953 | 0.42 (−0.867) | 30.8 |