The phrase "a baseline sample" is correct and usable in written English.
It can be used in contexts such as research, data analysis, or quality control to refer to a standard or reference point for comparison.
Example: "To assess the effectiveness of the new treatment, we first collected a baseline sample of patient data."
Alternatives: "a reference sample" or "a control sample".
However, the fatigue life of the as-clad sample is lower as compared to a baseline sample without a notch.
Both the as-clad and post-heat treated (PHT) samples were compared to a baseline sample with an artificial notch to simulate damaged condition.
A cohort design with no treatment partitioning was used, comparing data from a baseline sample in 1993 and a post-intervention sample in 1998.
Eight hundred and thirty couples enrolled in a condom efficacy study were asked to collect a baseline sample of ejaculate from the inside of the first study condom they used and to collect a postcoital vaginal sample whenever a study condom broke or slipped off during intercourse.
Baker says they had trouble finding participants, given the legal concerns of marijuana-smoking parents and possibly because they required subjects to not smoke for 24 hours in order to get a baseline sample of their milk.
ΔΔCT was calculated by setting a choosing a baseline sample (ΔΔCT set to 0) and comparing all other samples to this baseline.
Both data sets used a pool of normal samples as a common baseline sample, respectively derived from human and dog samples (see Methods).
It was found that exposure of Fe zeolite SCR catalyst to P resulted in a loss of NOx conversion and an increase of NH3 slip relative to a degreened baseline sample.
Two patients (one from the Kibaoni HC area and one from Kining'ina) were excluded from the analyses (venipuncture unfeasible in one patient; treatment initiated before baseline sampling in the other one), leaving 148 patients with a valid baseline sample, of whom 64 (43.2%) were male and 84 (56.8%) female (3 (2.0%) pregnant in 3rd trimester).
While data will be analysed by intention to treat, the sample size allows for 20% attrition, deriving a target baseline sample of 154.
Allowing for a drop out of 20% at time 2 and 30% at time 3, a total baseline sample of 436 participants is required.
