Fig. 1From: Assessment of quality of life in individuals with chronic headache. Psychometric properties of the WHOQOL-BREFFactor structure of the WHOQOL-BREF in individuals with self-reported chronic headache residing in Austria (numbers displayed on the straight and curved arrows signify completely standardized factor loadings and covariances, respectively; Austrian Health Interview Survey, 2013–2015, n = 963; All factor loadings/covariances were significant at p < 0.001)Back to article page