The person-level characteristics of individuals who contributed to the large-scale citizen science programme Garden Wildlife Health (GWH), on a regular (Systematic, n = 177) and ad hoc (Opportunistic, n = 218) basis, compared with the wider UK population. National population data were obtained from the 2011 Census (Office for National Statistics, 2014), with the exception of household income (before tax) which was drawn from the Institute for Fiscal Studies (Brewer et al., 2007). The star indicates a combined percentage for individuals who have completed a Bachelor level qualification or higher.