Table 1

 Characteristics of opt-in and opt-out participants at baseline (n = 152)

CharacteristicOpt-in (n = 92)Opt-out (n = 60)p Value
SEIFA, Socioeconomic Index for Area (score of relative socioeconomic disadvantage). Provided by the Australian Bureau of Statistics.
Age distribution in years (%)
    50–5430 (32.6)20 (33.3)0.99
    55–6440 (43.5)26 (43.3)
    65–7422 (23.7)14 (23.3)
Sex, male (%)29 (31.5)24 (40.0)0.30
SEIFA score below 75% quantile (lower socioeconomic status)12 (13.0)8 (13.3)0.96