“…Fig 6 shows that most of the 130 included studies considered age (n = 115) [14–17, 22–29, 31–50, 53, 55, 56, 59–64, 66–73, 75–77, 80–92, 95–102, 104–108, 110–129, 131, 133–143, 155, 156] and/or sex (n = 112) [15–19, 21–26, 28, 29, 31–38, 40–50, 53, 55, 56, 58–92, 95–108, 110–112, 114–116, 118–123, 125–129, 131, 133–143, 155, 156] in their analyses. On average around 40% of all studies included some sort of socioeconomic indicator mirroring educational attainment [15, 17, 21–24, 32, 34, 35, 37–…”