2.3.1. Stress
Stress was assessed using a multi-dimensional approach: By means of real-time data collection,both subjective and physiological stress was measured.
Momentary subjective stress: Momentary subjective stress levels were measured using the item ‘At this moment, I feel stressed’, which was answered on a 5-point Likert scale ranging from 0 to 4.
Low scores indicate low levels of stress and high scores indicate high levels of stress, respectively.
In order to keep the compliance rate as high as possible we decided to use a single-item measure for stress which has recently been shown to have sufficient psychometric properties.