The phrase "a longitudinal trial" is correct and usable in written English.
It can be used in the context of research or studies that observe subjects over a period of time to assess changes or outcomes.
Example: "The researchers conducted a longitudinal trial to evaluate the long-term effects of the new medication on patients."
Alternatives: "a longitudinal study" or "a long-term trial".
Using a longitudinal trial design in which three plasma samples were collected from 15 autistic and 12 non-autistic age-matched controls over the course of 1 year, universal and unambiguous alterations in lipid metabolism were observed.
Before a PRO can be used confidently as an outcome measure in a longitudinal trial, studies must demonstrate the PRO's ability to capture change over time in the target population.
Prospective serial observations in a large patient cohort will more accurately define the accuracy and validity of CD4 T-cell assays for clinical prognostications, and a longitudinal trial is currently in progress.
This procedure requires a longitudinal trial.
However, the conduct of a longitudinal trial requires patient follow-up.
The predictive validity of the presented model requires a longitudinal trial.
We have been engaged in a prospective, longitudinal trial utilising a comprehensive neuropsychological assessment to determine the neurocognitive and neurobehavioural sequelae associated with adjuvant TAM therapy.
This work was an observational study that should be validated further in a prospective longitudinal trial.
This study should provide a unique data source from a randomized, controlled, longitudinal trial to investigate the effects of a form of ASTM on cardiovascular autonomic and neuropsychological health in LLD.
We sought to investigate the temporal relationships between catastrophizing and indices of both clinical pain (substudy 1) and experimentally-induced pain (substudy 2) in a larger randomized controlled longitudinal trial.
A large cluster-randomized controlled longitudinal trial in rural Bangladesh evaluated a five-year intervention involving all three components of IMCI, and included training of health providers, household visits by trained health workers, and mosque-based sermons on IMCI-related topics.
