In terms of validity, The British Psychological Society and the US Department of Labor both stipulate that a good Concurrent Validity score should exceed 0.30.
Scores rarely exceed 0.40 but all scales in MTQ48 score between 0.30 and 0.42
In terms of reliability the MTQ48 has an overall test-retest coefficient of .90
All subscales reached the minimum acceptable level (0.70) recommended by Kline (Kline, 1999) when investigating the reliability of psychological constructs. This supports the homogeneity of each subscale and the MTQ48 as a whole.
The MTQ-PLUS current Reliabity scores are extremely impressive and are shown below: