For comparison, samples were diluted to 1 optical density (OD).
For comparison samples were tested with one of the commercial IR6 ELISAs.
In the current study, we used a quasi-experimental, post-test only design with independent historical and contemporaneous comparison samples.
Students enrolled in RHSs had elevated levels of risk factors for substance use and relapse relative to both the local and national comparison samples.
Thus, we use matching to construct comparison samples of ethnic Danes according to their parents' socioeconomic background, employment status and education.
For the intra-flume comparison, samples from all three regions of flume 3 were investigated at days 7, 14, and 22.
In comparison, samples of PFo collected from mainland China were rolled leaves, without odor and the surface color was mainly dark green and brown.
In comparison, samples with no mesh insert showed only gradual changes in the tilt angle (angle between local symmetry axis and flow direction).
As a base of comparison, samples were also produced under the same conditions using a low cost mineral filler: calcium carbonate (CaCO3).
The aims of this study were to examine the characteristics of youth who choose to attend RHSs, and to compare them with local and national comparison samples of youth in recovery from SUDs who were not enrolled in RHSs.
In an attempt to take such differences into account Behrenz et al. ([2007]) construct matched comparison samples of ethnic natives and second-generation immigrants according to parents' socioeconomic background, age, occupational status, and county of residence.
