Survival analysis using a Cox proportional hazard model was estimated using time from index to the first outcome.
The model constructed was the same model as Model 1, however using time from calving until culling due to reproductive problems as dependent variable.
Hazard ratios are based on a Cox proportional hazards model involving 6773 men (1827 events) with information on all risk factors, and using time from study entry as the time scale.
Kaplan-Meier analysis was performed to analyze the cumulative probability of unfavorable outcome, i.e. failure, in new and previously treated patients by using time from TB treatment initiation to the last medical visit.
One advantage of using time from admission is that it defines a fixed window that is the same for all patients and hence for all hospitals, whatever their discharge policies or opportunities.
For each indicator, we used time series from 1970 until 2003 or 2004, depending on the availability of the data.
They are synchronised using time transmission from the Global Positioning System (GPS) satellites.
Age at circumcision (time of exposure) was calculated using time elapsed from birth to the reported date of circumcision.
We conduct three separate C&RT analyses using time series data from Atlanta, Dallas and St . Louis
And depending upon the leader, it was used from time to time to divert attention to prevent political movements.
