When available, relevant clinical information on the original referral sample form was used to supplement the data from the written questionnaire.
Then the 'snowball sampling method' - also known as the chain referral sampling - was utilized to identify study participants.
First, the sequential referral sampling method is likely to create a skewed sample of women who's views were well known because they were more vocal and/or articulate than some of the other women in the cohort.
Using email to adapt the chain referral sampling approach allowed me to tap into many different social networks, stemming from a single 'seed' who did not even belong to the target population.
Snowball sample, also called a referral sample, is one where the initial respondents typically are chosen using probability methods.
Clinical referral sample with supplementary data obtained from speech recordings and interviews.
Checks were made to verify that the LE and BIL children were stuttering by comparing age at stuttering onset and gender ratio for these speaker groups against monolingual speakers from a referral sample who stuttered (MONO).
The Ct positive young people, who begin the web-based chain referral sampling in the proposed intervention, will have experiences with Ct testing and treatment.
At the referral laboratory samples were initially cross checked on HIV1&11 Determine Rapid kit and all reactive samples were further tested using two different ELISA (HIV Ag/Ab Combination by Abbott Murex and HIV Ansi-labsystem kits using Multiscan MS ELISA Reader).
The initial pilot study 25 took place in a single district Child and Adolescent Mental Health Service, whereas the subsequent replication 26 and the current study used wider referral samples (in the current case from a catchment of approximately five million); referrals tended towards high baseline severity, complexity, and chronicity.
