Phase 2. Adding new questions and validating the new questionnaire.
Therefore, in this quite recent application of DIC, the reproducibility of the method has to be questioned and validated, with help of some more conventional strain measurements devices.
These questions were based on questions used and validated in previous studies [ 2, 22].
The first two questions were translations of questions developed and validated by British scientists [ 46].
Functional health literacy will be assessed by means of three screening questions developed and validated by Chew and colleagues.
In addition, physical activity is measured by 10 activity questions assessed and validated in NHANES III [ 45, 46].
The QOL-CS questionnaire (41 questions), developed and validated specifically for cancer survivors, measures four domains of QOL (physical, psychological, social, and spiritual well-being).
We evaluated DE symptoms using the seven questions developed and validated by Gulati et al, 4 8 9 which focus on ocular discomforts: awareness, tearing, burning, blurring and fluctuating vision, irritation, foreign body sensation, and tired eyes (box 1).
For sedentary behaviours, we used questions developed and validated by Marshall et al, 22 which assess time spent sitting on weekdays and weekend days: (1) travelling to and from places, (2) at work, (3) watching television, (4) using a computer or tablet at home and (5) for leisure, not including television viewing.
