Table 1 Patients’ characteristics
Number of patients | Total (n=170) | Prediction model analysis group (n=85) | External validation group (n=85) | P value |
|---|---|---|---|---|
Sex (Male:Female) | 34 : 136 | 18 : 67 | 16 : 69 | 0.701 |
Age (years) | 66.5 ± 10.4 (39 – 87) | 65.9±10.1 | 67.1 ± 10.7 | 0.452 |
BMI (kg/m2) | 24.1 ± 3.9 (16.6 – 35.4) | 24.4±4.1 | 23.9 ± 3.6 | 0.370 |
Spondylolisthesis (%) | 40 (23.5%) | 19 (22.3%) | 21 (24.7%) | 0.718 |
Compression fracture (%) | 11 (6.4%) | 5 (5.9%) | 6 (7.1%) | 0.755 |
Lumbar Scoliosis | 55 (32.4%) | 30 (35.3%) | 25 (29.4%) | 0.412 |
Osteoarthritis on contralateral side (%) | 89 (52.5%) | 48 (56.5%) | 41 (48.2%) | 0.282 |
Follow up period of radiograph (%) | 11.4 ± 7.3 (3.1 – 23.9) | 12.1 ± 7.7 | 10.6 ± 6.7 | 0.212 |