Table 3.
Simulated Data
| Variable | Correlation structure between all three BMD measurements | ||||
|---|---|---|---|---|---|
| (0, 0, 0) | (0.2, 0.2, 0.2) | (0.4, 0.4, 0.4) | (0.6, 0.6, 0.6) | (0.8, 0.8, 0.8) | |
| Congruence | |||||
| No. of patients with all three BMD T‐scores congruent for a WHO diagnosis of osteoporosis (%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 2 (0.2%) |
| No. of patients with all three BMD T‐scores congruent for a WHO diagnosis of osteopenia (%) | 4 (0.4%) | 12 (1.2%) | 19 (1.9%) | 31 (3.1%) | 52 (5.2%) |
| No. of patients with all three BMD T‐scores congruent for a WHO diagnosis of a normal BMD (%) | 595 (59.5%) | 616 (61.6%) | 650 (65.0%) | 690 (69.0%) | 745 (74.5%) |
| Diagnoses | |||||
| WHO diagnosis of osteoporosis (%) | 14 (1.4%) | 11 (1.1%) | 10 (1.0%) | 10 (1.0%) | 10 (1.0%) |
| Statistics‐based diagnosis of osteoporosis (%) | 47 (4.7%) | 47 (4.7%) | 47 (4.7%) | 47 (4.7%) | 47 (4.7%) |
| WHO diagnosis of osteopenia (%) | 391 (39.1%) | 373 (37.3%) | 340 (34.0%) | 300 (30.0%) | 245 (24.5%) |
| Statistics‐based diagnosis of osteopenia (%) | 343 (34.3%) | 343 (34.3%) | 343 (34.3%) | 343 (34.3%) | 343 (34.3%) |
| WHO diagnosis of Normal BMD (%) | 595 (59.5%) | 616 (61.6%) | 650 (65.0%) | 690 (69.0%) | 745 (74.5%) |
| Statistics‐based diagnosis of normal BMD (%) | 610 (58.1%) | 610 (61.0%) | 610 (61.0%) | 610 (61.0%) | 610 (61.0%) |
WHO = World Health Organization guidelines used for the diagnosis of osteopenia, osteoporosis, and normal BMD.
(0, 0, 0): correlation between L1‐L4 BMD and femoral neck BMD = 0, correlation between L1‐L4 BMD and total femur BMD = 0, correlation between femoral neck BMD and total femur BMD = 0.
(0.2, 0.2, 0.2): correlation between L1‐L4 BMD and femoral neck BMD = 0.4, correlation between L1‐L4 BMD and total femur BMD = 0.4, correlation between femoral neck BMD and total femur BMD = 0.4.
(0.4, 0.4, 0.4): correlation between L1‐L4 BMD and femoral neck BMD = 0.4, correlation between L1‐L4 BMD and total femur BMD = 0.4, correlation between femoral neck BMD and total femur BMD = 0.4.
(0.6, 0.6, 0.6): correlation between L1‐L4 BMD and femoral neck BMD =0.6, correlation between L1‐L4 BMD and total femur BMD = 0.6, correlation between femoral neck BMD and total femur BMD = 0.6.
(0.8, 0.8, 0.8): correlation between L1‐L4 BMD and femoral neck BMD = 0.8, correlation between L1‐L4 BMD and total femur BMD = 0.8, correlation between femoral neck BMD and total femur BMD = 0.8.