Table 2.

Comparison of demographic data between the training and test sets.

Variables	Training Set	Test Set	p-Value
Sex (female)	79.6%	79.9%	0.584
Age	77.2 ± 0.18	77.2 ± 0.28	0.834
Body Mass Index	21.6 ± 0.06	21.8 ± 0.13	0.975
Primary fracture site
Proximal part of the femur	73.6%	73.9%	0.837
Proximal part of the humerus	6.3%	6.1%	0.895
Distal part of the radius	19.9%	20.1%	0.758
Diabetes	19.6%	18.8%	0.459
Chronic kidney disease	21.6%	21.5%	0.915
Rheumatoid arthritis	2.7%	2.5%	0.785
Chronic obstructive pulmonary disease	3.8%	4.1%	0.588
Presence of malignant tumor	12.5%	11.1%	0.077
Glucocorticoid use	2.8%	2.7%	0.758
Warfarin use	5.0%	5.5%	0.333
Pre-operative Ca or Vit. D	6.0%	6.7%	0.262
Pre-operative treatments for osteoporosis	7.9%	8.0%	0.803
Post-operative Ca or Vit. D	12.9%	12.4%	0.63
Post-operative treatments for osteoporosis	28.7%	28.6%	0.92
Follow-ups more than 24 months	39.3%	39.0%	0.781

Data presented as mean (standard error of the mean). Ca: calcium; Vit. D: vitamin D3.