“…A description of the study samples, measurements and variables is given in Appendix 1. The majority of the studies were conducted in the developed world, with 16 studies from the USA (Barnett 2005, Barnett and Klitzing 2006, Caldwell et al 1999, Caldwell and Kivel 1998, Caldwell and Smith 1995, Iso-Ahola and Crowley 1991, Iso-Ahola and Weissinger 1990, Larson and Richards 1991, Newberry and Duncan 2001, Sharp et al 2006, Weissinger, Caldwell and Bandolas 1992, Widmer, Ellis and Munson 2003, Widmer, Ellis and Trunnell 1996, Yang and Yoh 2005. Two studies were from Canada Weissinger 1992, Shaw, Caldwell andKleiber 1996) and three studies were from Australia (Farnworth 1998, Gordon and Caltabiano 1996, Patterson, Pegg and Dobson-Patterson 2000.…”