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Different study cohorts (participation in OS or CTs, and different treatment assignments for all three CTs) were treated as strata in the model.
Different study cohorts (participation in OS or CTs, and different treatment assignments for all three clinical trials) were treated as strata in the model to take into account possible different baseline hazards in different sub-groups and treatment effects.
Different study cohorts (participation in observational study or clinical trials and different treatment assignments for all three clinical trials) were treated as strata in the model in order to take into account possible different baseline hazards in different subgroups and treatment effects.
In the blinded period, 19% (11 out of 57) of CDDP/epi gel treated patients (stratum I, 23%; stratum II, 15%) achieved patient benefit vs 9% (three out of 35) of placebo recipients (stratum I, 12%; stratum II, 6%).
However, the DSC results showed that the bound water content in the stratum corneum treated with AcHA was markedly greater than that of HA-treated stratum corneum.
Ration was treated as a stratum variable (strata option) to allow for non proportional hazards when comparing the effect of egg size between the two food treatments [88].
We treated subject age strata and NHANES survey (NHANES III or NHANES 9908) as stratification variables.
Inborn and Outborn hospitals were analysed separately and the two hospitals in each group were treated as separate strata.
The events are treated as independent strata in the model, and time is expressed from randomization to each event.
Most patients in the ESA-naïve and prior ESA-treated strata were Caucasian and had a median age of about 76 years.
Following Zanutto (2006) the following expression summarizes the estimated ATET for the whole sample: mathop sum limits_{s = 1}^{2} frac{{mathop sum nolimits_{{i in S_{Ts} }} w_{i} }}{{mathop sum nolimits_{s = 1}^{2} mathop sum nolimits_{{i in S_{Ts} }} w_{i} }}ATET_{s}where w i denotes the sampling weight for individual i and (S_{Ts}) corresponds to the set of treated individuals in stratum (s).
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