| Affected n (%) | Unaffected n (%) | p-value | |
| Professional occupation | 33(35%) | 37(40%) | 0.44 |
| Income >NZ$70,000* | 37(54%) | 38(55%) | 0.94 |
| Tertiary education | 53(56%) | 59(64%) | 0.24 |
| Married/ de facto relationship | 58(61%) | 55(60%) | 0.86 |
| Non-smokers | 55(58%) | 51(55%) | 0.73 |
| Non-drinkers or social drinkers | 37(39%) | 44(48%) | 0.22 |
| ≥2.5 h/week exercise | 63(66%) | 68(74%) | 0.26 |
*n = 68 (affected); 69 (unaffected); NZ$70,000 = median household income in 2013