This was confirmed by Nattress (1996), all of whose 50 subjects had completed higher education and pursued careers.

Another 5,000 subjects also completed the telephone interview and mail questionnaire as part of 11 related studies.

His subjects would complete complex tasks and then provide a retrospective account of their cognitive processes during the task.

All subjects also completed four 24-hour dietary recalls, which included 4 randomly selected days within two weeks of the clinic visit.

While subjects were completing the assigned task, an unexpected visual stimulus was presented.

One month later, all subjects again completed the same questionnaire.

On day one, subjects reported to a laboratory after a 10-hour fast, completed a health status report, and had either a high- or low-nitrate breakfast.

All subjects (404 cases and 391 controls) completed an extensive interview for demographic, behavioral, and past ultraviolet exposure information.

The subjects completed 10 km cycle time trials.

The subjects could not complete the task.