We tried to test the model by stratifying the sample into four subgroups (female aged 18 44, female aged 45 or above, male aged 18 44 and male aged 45 or above).
By stratifying the sample frame for all subjects on sick leave, we intended to select enough individuals with pain so future studies could use this data.
By stratifying the sample into three age groups we showed that the size of the sex effects may be age dependent for some genes, but the direction of the effects are highly concordant between age groups.
Hazard functions were estimated by stratifying the sample into two age groups, 40 59 and 60 79 (see Additional file 1, Table 9), due to the relative infrequency of endpoints in quinquennial age groups.
Furthermore it was reported that no difference in terms of progression free survival rate and tumor control was seen by stratifying the sample per histology of the brain metastases.
We sampled the entire data set of approximately 8.4 million per 5-s recordings of incubation; an autocorrelation of the data points was avoided by stratifying the sample to 0.025% incubation data points per nest, with points at least 2.5h apart from each other.
Heterogeneity in associations related to child sex or children's fat intakes were evaluated by including interaction terms in the final models and by stratifying the sample according to sex or fat intakes at or above versus below the median value of 35.7% of energy intake.
This study showed age-specific rates of the different histological cataract type, by stratifying the population sample by age.
In this paper, we address this heterogeneity problem by stratifying the reservoir sample among the underlying sub-streams.
We identified a subset of patients with high benefit profiles for rhTM treatment by stratifying the study sample according to APACHE II and SOFA scores, using survival CART analysis.
