All were based in healthcare settings, with two studies reporting on samples of registered nurses (Gerberich et al. 2005; Farrell et al. 2014), one study conducted on staff in psychiatric units (Gale et al. 2002) and a further on all personnel in emergency wards (Landau and Bendalak 2008).
All included studies reported on different samples (32 samples in total).
Of these studies, 70 reported on female samples, 49 reported on male samples, and 13 reported on both male and female samples.
Yet, these results are difficult to generalise as the vast majority of such studies were reported on constrained samples, mainly university students [23, 33].
The accuracy values of each database is reported on the samples from the testing set using the features selected by the proposed method.
For example, in a context of concerns for the air quality at Alcoa's Wagerup refinery, it was Alcoa, not the State Government or an independent body, who gathered, tested and reported on air samples.
In fact, most other studies reported on fresh samples obtained directly from dogs.
Good psychometric properties have been reported on US samples with internal consistency of 0.76 (Landgraf et al, 1999).
For example, only eight of the 48 studies in the meta-analysis by Mitchell et al. [ 10] reported on fasting samples.
