TABLE II.

Incremental Costs Attributable to Hip Fracture by Type and Post-Fracture Period

Post-Fracture Period	Incremental Cost* (USD)	Percentage of Annual Cost	t Value	P Value
Intertrochanteric hip fractures (n = 2,506)†
90 days	$44,135 ± $20,370	84%	108.47	<0.0001
365 days	$52,512 ± $43,188	100%	60.87	<0.0001
All hip fractures (n = 5,905)‡
90 days	$42,388 ± $20,757	83.9%	156.92	<0.0001
365 days	$50,508 ± $44,731	100%	86.77	<0.0001

^*The values are given as the mean and the standard deviation.

^†Total annual costs to the U.S. health-care system: $52,512 × 2,506 × 20 = $2.63 billion.

^‡Total annual costs to the U.S. health-care system: $50,508 × 5,905 × 20 = $5.96 billion.