Table 1.
Characteristics of participants according to equivalized household income quartiles, stratified by sex.
| Men (n=40,038) | Women (n=43,062) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Equivalized Household Income Quartiles (10,000 yen) | |||||||||
| 1 (≤132.9) | 2 (133.0–201.9) | 3 (202.0–317.9) | 4 (318.0≤) | 1 (≤112.4) | 2 (112.5–187.9) | 3 (188.0–275.9) | 4 (276.0≤) | ||
| Population at riska, No. | 10,028.5 | 9707.0 | 10,577.6 | 9724.9 | 10,769.2 | 10,311.2 | 11,516.0 | 10,465.6 | |
| Population at risk, % | 25.1 | 24.2 | 26.4 | 24.3 | 25.0 | 24.0 | 26.7 | 24.3 | |
| Mean GDS, score | 4.6 | 3.6 | 3.1 | 2.5 | 4.3 | 3.8 | 3.1 | 2.7 | |
| GDS score ≥ 5, No. | 4192.4 | 2987.1 | 2669.6 | 1715.9 | 4169.2 | 3391.5 | 2792.6 | 2023.7 | |
| GDS score ≥ 5, % | 41.8 | 30.8 | 25.2 | 17.6 | 38.7 | 32.9 | 24.2 | 19.3 | |
| Age, years | 74.7 | 73.4 | 73.4 | 73.1 | 75.4 | 73.9 | 73.3 | 73.6 | |
| Low educational attainment (<10 years), % | 63.6 | 45.7 | 36.1 | 28.1 | 66.9 | 54.9 | 41.7 | 38.1 | |
| Married, % | 81.3 | 90.2 | 87.6 | 88.9 | 51.0 | 53.9 | 69.2 | 64.2 | |
| Fair/poor self-rated health, % | 27.4 | 21.5 | 19.1 | 15.6 | 25.8 | 21.3 | 16.6 | 15.1 | |
| Number of illnesses | 1.7 | 1.6 | 1.6 | 1.5 | 1.8 | 1.7 | 1.6 | 1.6 | |
| TMIG-IC, score | 10.6 | 11.1 | 11.4 | 11.6 | 11.1 | 11.5 | 11.8 | 11.9 | |
Abbreviations: GDS, Geriatric Depression Scale
a
Average of 10 imputed datasets.