Table 4.

Observed 1-year risk of hip fracture among osteoporotic women aged ≥65 years and estimates from risk scoring system

Risk group (score)	Number	Observed risk (%)	Risk from scoring system (%)	Ratioa
All patients	6784	2.2	2.4	1.1
Quintiles of women, by risk score
1st (≤10)	1556	0.9	0.7	0.7
2nd (11–15)	1179	1.5	1.3	0.9
3rd (16–20)	1504	1.5	2.0	1.3
4th (21–25)	1332	3.2	3.0	1.0
5th (≥26)	1213	4.5	5.4	1.2

Example: on an overall basis, the percentage of women who had a hip fracture during 1-year follow-up period was 2.2%, versus a mean predicted risk (based on the scoring system) of 2.4%, corresponding to a ratio of 1.1

^aObserved risk versus risk from scoring system