The British scientists who conducted the research identified study participants based largely on a single symptom: disabling and unexplained fatigue lasting at least six months.
From the earliest identified study to those conducted before the end of 2000, recurring themes emerged, as did characteristics unique to particular studies.
This qualitative sample size permits the deep, information-rich, and case-oriented analysis of a focused group of subjects with clearly identified study objectives, and meets the qualitative research design and sampling recommendations of Creswell (2007).
For each identified study, additional studies were sought from its references, citations and from the PubMed option 'Related Articles'.
Additional studies were sought from references, citations and from the PubMed option 'Related Articles', for each identified study.
For the present nested case-control study, we identified study participants who did not report a history of heart attack or stroke at the baseline clinic visit.
In the last identified study [32], possible capsular switching from a non-vaccine serotype toward a vaccine serotype was detected once among 197 isolates collected over 1 year in vaccinated children.
For each identified study that met the selection criteria, the following data were extracted country, study design, population, intervention, comparator, perspective, model type, primary outcome, discount rate, time horizon, and price year on to an Excel spreadsheet.
For an identified study to be eligible for inclusion, sufficient information had to be available for the numbers of cases and controls with each genotype to be deducible (for case-control studies), or for the numbers of transmitted and untransmitted risk alleles from heterozygote parents to affected offspring to be deducible (for studies in family trios).
Six key informants identified study participants.
We identified study design features associated with acceptable model fits.
