Table 2. Regression Models.
| Variable | Unadjusted (n ≤73 250) | Partially Adjusted (n = 73 128) | Fully Adjusted (n = 73 079) | |||
|---|---|---|---|---|---|---|
| RR (95% CI) | P Value | RR (95% CI) | P Value | RR (95% CI) | P Value | |
| Differences in risk between those aged 100.9 y and 81.4 y | 0.78 (0.67-0.92) | .002 | 0.75 (0.64-0.88) | <.001 | 0.68 (0.58-0.79) | <.001 |
| Sex | ||||||
| Male | 0.79 (0.76-0.81) | <.001 | 0.78 (0.76-0.81) | <.001 | 1.00 (0.97-1.03) | .84 |
| Female | 1 [Reference] | 1 [Reference] | 1 [Reference] | |||
| Ethnicity | ||||||
| European | 1 [Reference] | <.001 | 1 [Reference] | <.001 | 1 [Reference] | <.001 |
| Māori | 1.04 (0.98-1.10) | 1.00 (0.95-1.07) | 1.02 (0.96-1.08) | |||
| Pacific | 0.92 (0.84-1.00) | 0.90 (0.83-0.98) | 1.06 (0.97-1.15) | |||
| Asian | 1.13 (1.04-1.22) | 1.12 (1.04-1.21) | 1.29 (1.20-1.40) | |||
| Other (including MELAA) | 1.30 (1.15-1.47) | 1.28 (1.13-1.45) | 1.31 (1.16-1.47) | |||
| Season | ||||||
| Summer | 1 [Reference] | .06 | 1 [Reference] | .06 | 1 [Reference] | .06 |
| Autumn | 1.05 (1.01-1.10) | 1.05 (1.01-1.10) | 1.05 (1.01-1.10) | |||
| Winter | 1.01 (0.96-1.05) | 1.01 (0.96-1.05) | 1.01 (0.97-1.05) | |||
| Spring | 1.02 (0.98-1.07) | 1.03 (0.98-1.07) | 1.03 (0.98-1.15) | |||
| Marital status | ||||||
| Married, civil union, or de facto committed relationship | 1 [Reference] | <.001 | NA | NA | 1 [Reference] | <.001 |
| Never married | 1.40 (1.30-1.51) | NA | 0.67 (0.62-0.74) | |||
| Widowed | 2.07 (2.00-2.14) | NA | 1.06 (1.00-1.12) | |||
| Separated/divorced | 2.08 (1.97-2.19) | NA | 0.92 (0.86-0.99) | |||
| Other | 1.31 (1.12-1.53) | NA | 0.63 (0.54-0.74) | |||
| Family support | ||||||
| No | 1 [Reference] | <.001 | NA | NA | 1 [Reference] | <.001 |
| Yes | 0.73 (0.70-0.76) | NA | 0.83 (0.79-0.86) | |||
| Living arrangements | ||||||
| Alone | 1 [Reference] | <.001 | NA | NA | 1 [Reference] | <.001 |
| With partner | 0.40 (0.38-0.41) | NA | 0.37 (0.35-0.40) | |||
| With family | 0.75 (0.72-0.78) | NA | 0.71 (0.68-0.74) | |||
| With others | 0.52 (0.47-0.57) | NA | 0.49 (0.45-0.54) | |||
| Depression | ||||||
| None, DRS score of 0 | 1 [Reference] | <.001 | NA | NA | 1 [Reference] | <.001 |
| Mild-moderate, DRS scores of 1-7 | 2.12 (2.05-2.18) | NA | 2.17 (2.11-2.24) | |||
| Moderate-severe, DRS scores of 8-14 | 3.36 (3.13-3.62) | NA | 3.45 (3.22-3.70) | |||
Abbreviations: DRS, Depression Rating Scale; MELAA, Middle Eastern, Latin American, African; NA, not applicable; RR, risk ratio.