Nowadays, the UWES is the most used instrument to measure engagement in the work place (Bakker et al. 2008).
The most used instrument was the state form of the STAI (14 studies, 73,7%).
The State scale of the STAI is the most used instrument in the present sample of papers and the effect sizes are similar between the two meta-analysis.
The SF-36 questionnaire was chosen since it is one of the most used instrument for the assessment of QoL in many different clinical fields.
In clinical studies, rod function is measured by scotopic electroretinogram, or by dark-adapted perimetry, for which the most used instrument is the Humphrey Field Analyzer (HFA) (Carl Zeiss Meditec Inc., USA) by means of "5.25 floppy discs and a light-pen".
Despite the increasing availability of these new tools, the Hamilton Rating Scale for Depression (HRSD) -first published back in 1960 [ 8], remains the most used instrument in clinical settings.
Ionization chambers are the most widely used instruments for dosimetry in radiotherapy.
The most frequently used instruments are the EORTC QLQ-C30 and its lung cancer modules LC13 or LC17.
The DRS (N = 12) and DRS-R98 (N = 9) were the most commonly used instruments for measuring responsiveness.
The Short Form 36-Item Survey is one of the most commonly used instruments for assessing health-related quality of life.
However, the most frequently used instruments, eg. SF-36 and EuroQoL-5D, were developed without input from intensive care survivors and may thus lack validity in these populations.
