Establishments were not contacted a-priori and no records were kept over the total of establishments contacted, as the interviewers approached establishments randomly and asked for the staff member who was more knowledgeable about the delivery details for that establishment.
In the second stage, workers at every establishment are randomly selected.
The sample of establishments was randomly selected, and included approximately half of the establishments of each type.
From each of these lists, establishments were selected randomly using slips of paper or random numbers generated by the computer.
After establishment, four treatments were randomly imposed to three replicate rhizotrons.
Rats were randomly grouped for establishment of chronic constriction injury (CCI) models.
The survey also provides information on the main individual characteristics of workers randomly selected at every establishment, such as education, sex, age, years working in the current establishment, type of contract, full/part-time job, etc.
It asks surveyed establishments to choose their employees randomly to answer detailed information about their salaries, employment status, gender, age, and educational background.9 It also provides information at the establishment level, such as industry type and firm size.
A questionnaire with 26 questions about management practices and parasite control routines was posted to 627 randomly selected horse establishments covering most types of horse management in Sweden.
Volunteer occupational physicians could include the employees of only one or two of the nursing homes they oversaw; if they were involved in several establishments, two of them were randomly selected.
