“…Some work is descriptive (e.g. Rendall et al, 2005, Skirbekk et al, 2006, Isen & Stevenson, 2010, Oppermann, 2017 and some work uses regression analysis (e.g. Naz et al, 2006, Jones & Tertilt, 2008, McCrary & Royer, 2011, Cygan-Rehm & Maeder, 2013, Fort et al, 2016.…”