Table 4. Adjusted prevalence ratios (95% confidence intervals) for geriatric depression scale score (≥5) in caregivers and non-caregivers by income groupa.
| Variables | CGb (n = 1,469) | Non-CGb (n = 16,641) | |
|---|---|---|---|
| APR (CI)cd | APR (CI)cd | Interaction pe | |
| Incomef (ref: 1st quartile) | .603 | ||
| 2nd quartile | 1.57 (1.09, 2.24) | 1.48 (1.32, 1.66) | |
| 3rd quartile | 2.32 (1.63, 3.28) | 1.76 (1.57, 1.97) | |
| 4th quartile | 2.62 (1.87, 3.68) | 2.30 (2.07, 2.56) | |
| Public assistance | 3.10 (1.45, 6.63) | 2.70 (2.19, 3.32) | |
| Missing | 2.18 (1.47, 3.24) | 1.77 (1.57, 2.01) |
aA Poisson regression model was utilized for data analysis.
bCG: caregivers
cAge, gender, education, marital status, work engagement, and disease were adjusted.
dAPR: adjusted prevalence ratios; CI: 95% confidence intervals.
eInteraction term of income by caregiving role was estimated using total sample (CG + non-CG). Age, gender, education, marital status, work engagement, disease, and caregiving role were adjusted. P-value for global test is shown.
f1st quartile: 3,180,000 JPY or higher; 2nd quartile: between 2,000,000 and 3,179,999 JPY; 3rd quartile: between 1,300,000 and 1,999,999 JPY; and 4th quartile: 1,299,999 JPY or lower. Public assistance group was independently categorized.