Table 2

All cause hospitalizations among patients diagnosed with ischemic stroke according to time since index stroke

At Risk
 All Cause Hospitalization

Time Period
 N*
 PY**
 Patients
 Hosp†
 %‡
 Freq§
 Hazard#
 Total Rate°
Month 1
 18,695
 1,429
 2,338
 2,440
 12.5
 1.04
 1.64
 1.71
Month 2
 16,821
 1,359
 1,375
 1,455
 8.2
 1.06
 1.01
 1.07
Months 3–6
 16,319
 5,274
 3,325
 4,386
 20.4
 0.44
 0.63
 0.83
Months 7–12
 15,361
 7,457
 3,436
 4,870
 22.4
 0.23
 0.46
 0.65
Year 2
 14,436
 13,642
 4,654
 7,935
 32.2
 0.14
 0.34
 0.58
Year 3
 12,917
 12,265
 3,992
 6,903
 30.9
 0.14
 0.33
 0.56
Year 4
 11,628
 11,081
 3,611
 5,948
 31.1
 0.14
 0.33
 0.54
Year 5
 10,514
 9,997
 3,269
 5,351
 31.1
 0.14
 0.33
 0.54

*N=number surviving to beginning of each time period

**PY=person years accumulated by patients during each period

†Hospitalization count in each period

‡% gives the proportion of patients hospitalized

§Frequency expressed as hospitalizations per patient hospitalized (per month)

#Hazard expressed as patients hospitalized per patient year

°Total rate expressed as hospitalizations per patient year

Caro et al. BMC Health Services Research 2006 6:99   doi:10.1186/1472-6963-6-99