“…Previous attempts have been made to shorten the ZTPI-inventory. For instance, 25-item (Wakefield et al, 2010), 20-item (Przepiorka et al, 2016), 18-item (Košťál et al, 2015), 17-item (Orosz et al, 2017) and 15-item (Košťál et al, 2015;McKay et al, 2014;Zhang et al, 2013) versions have been suggested. Although they were found to be psychometrically sound in the initial research reports, findings have been difficult to replicate (McKay et al, 2014(McKay et al, , 2015Worrell et al, 2018).…”