Random samples of time, day of week, and location (i.e., milepost) combinations were collected for multilane arterials in the state of Florida and matched with severe crashes from the corresponding corridor to form matched strata consisting of severe crash and non-crash cases.
For instance, there are altogether 4,011 strata for the HLA- DRB1, - DQB1 and - A genotypes, resulting in an effective sample size of 1,133 cases and 453 controls, after those strata consisting of all controls or all cases were eliminated.
Ground strata observations consisted of individual plants centered nadir to the line and relative to the transect endpoint furthest from water.
From the list of named contacts, contacts were apportioned into strata that consisted of sex/drug associates, friends, paying sexual partners, and other social contacts.
The heterogeneity could be explained in some strata, but they consisted of small numbers.
The upper part of this sequence, which was 10- to 13-m thick, was characterized by a set of acoustically transparent layers, and the lower part consisted of well-stratified strata suggestive of thin alternations of sand and mud.
If a cohort consisted of sub-cohorts from different survey periods (as in the case of all MORGAM cohorts except SHIP Greifswald) or was a multicentre study (SHARE, SENECA), then a stratified Cox model was employed allowing the baseline hazard to vary between strata that is, across sub-cohorts or centres, respectively.
While the western sector of the Lesser Caucasus and the Talish in the far southeast are formed chiefly from deposits laid down about 50 million years ago in the downwarp episode of the geosyncline, the central and eastern sectors of the Lesser Caucasus consist of sedimentary strata intruded in places with volcanic rock that are at least twice as old.
As with the majority of the Andean volcanoes, Cerro Azul is a stratovolcano, meaning that it consists of layers, or strata, of volcanic ash and lava flows.
The cost-effectiveness measures can be computed for a single, homogeneous population or for separate components of a heterogeneous population that consists of subpopulations or strata with differences in disease incidence, case fatality rate, life expectancy, or vaccine efficacy.
