- Each participant gave a daily urine sample when they first arrived at work and then four times throughout the day.
- Self-reports of mood, alertness and nicotine + caffiene consumption were given.
Baseline measurements were also taken at home of:
- Aldrenaline levels in urine.
- Body temperature
- Self-rating of words such as sleepiness, efficiency etc from a scale of 0 to maximal.
- Caffiene and nicotine consumption.
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