Table 4.

Incidence of hip fracture stratified by the frequency of admission under the coding of PLA.

	N	Event	PYs	Rate	Adjusted HR 95% CI
Comparison cohort	102120	2067	613796	33.7	Ref
PLA cohort
1	23869	544	137051	39.7	1.08 (0.98–1.19)
2-3	564	35	378	927	18.4 (13.0–26.1)
≥4	1097	37	157	2353	46.0 (31.2–67.8)
p for trend					<0.001

Model adjusted for gender, age, and comorbidities. PLA: pyogenic liver abscess; N: number of subjects within the cohort; event: hip fracture numbers; PYs: person-years; rate: incidence rate per 10000 person-years; HR: hazard ratio.