Conversely, the mortality rate for children diagnosed with severe sepsis declined despite constant age-adjusted hospitalization.
A Poisson approach would have assumed: (1) a constant rate of hospitalization during a given observation period (and thus ignored the issue of removal of those at highest risk of the hospitalization or at risk of death during follow-up), and (2) independence of risk of subsequent hospitalization from having had previous hospitalizations.
The model included three time-independent covariates whose values remained constant over the hospitalization: patient age2 (expressed as a restricted cubic spline); admission type (emergent surgical and non-surgical, elective surgical and non-surgical); and the Elixhauser score [ 8] to summarize the patient's comorbidities at admission.
The distribution of mood disorder hospitalizations by hospital size remained fairly constant (9-10% in small hospitals, 22-24% in medium hospitals, and 68% in large hospitals over 2000-2006).
Additionally, while exhibiting a similar absolute rise, CDAD primary diagnosis admissions as a fraction of all CDAD hospitalizations remained constant.
Differences in expenditure between the treatment and control groups at index hospitalization were almost constant at €10,000, which reflects the difference in DRG tariff when the ICD is initially implanted.
Thus, there may be a general increase in the incidence of typhoid fever among children during the wet season, but this was not associated with an increase in severe typhoid cases requiring hospitalization, which remained constant throughout the year.
We assessed the effect of prescription fill rates for users of each drug class on the risk of hospitalization, total annual hospital days, and spending on Medicare services measured in constant 2006 dollars, using the Consumer Price Index (12).
We therefore assumed constant ratios of rates of hospitalizations for males and females for all races.
Mood disorder hospitalizations remained relatively constant from 2000-2006, but diagnoses of depressive disorders decreased while diagnoses of bipolar disorders increased.
