| Baseline characteristics | Men (4061 respondents) | Incidence rate | Women (3612 respondents) | Incidence rate | ||
| N | Incidence/person–year | N | Incidence/person–year | |||
| Age (years) | ||||||
| 65–74 | 2900 | 234/8368 | 0.028 | 2464 | 157/7167 | 0.022 |
| 75+ | 1161 | 270/3088 | 0.087 | 1148 | 275/3049 | 0.090 |
| Marital status | ||||||
| Married | 3660 | 420/10 371 | 0.040 | 2205 | 182/6357 | 0.029 |
| Divorced/separated | 335 | 69/908 | 0.076 | 1267 | 228/3469 | 0.066 |
| Never married | 22 | 4/58 | 0.069 | 89 | 19/239 | 0.079 |
| Other | 15 | 4/41 | 0.097 | 11 | 0/33 | 0.000 |
| Household equivalised income* (ranges in million Japanese yen) | ||||||
| Quartile 1 (0.88–1.57) | 809 | 139/2216 | 0.063 | 1032 | 152/2887 | 0.053 |
| Quartile 2 (1.58–2.46) | 1118 | 129/3162 | 0.041 | 873 | 90/2494 | 0.036 |
| Quartile 3 (2.47–3.17) | 992 | 123/2806 | 0.044 | 729 | 66/2086 | 0.032 |
| Quartile 4 (3.18–10.66) | 1142 | 113/3272 | 0.035 | 978 | 124/2750 | 0.045 |
| Mean (SD) | 2.53 (1.35) | 2.38 (1.46) | ||||
| Educational attainment | ||||||
| 9 years or less | 2225 | 312/6233 | 0.050 | 2213 | 276/6240 | 0.044 |
| 10+ years | 1804 | 188/5136 | 0.037 | 1364 | 150/3881 | 0.039 |
| Medical care utilisation | ||||||
| None (no health problems) | 1198 | 89/3478 | 0.026 | 907 | 68/2630 | 0.026 |
| Have health problems but not have medical care by patient choice | 233 | 26/662 | 0.039 | 238 | 24/682 | 0.035 |
| Have regular medical care | 2505 | 375/6962 | 0.054 | 2314 | 324/6467 | 0.050 |
| Smoking | ||||||
| Never | 1104 | 136/3113 | 0.044 | 3317 | 388/9395 | 0.041 |
| Ever | 1900 | 243/5352 | 0.045 | 98 | 15/268 | 0.056 |
| Current | 944 | 107/2678 | 0.040 | 82 | 18/223 | 0.081 |
| Alcohol consumption | ||||||
| None | 1674 | 286/4588 | 0.062 | 3104 | 392/8745 | 0.045 |
| Drink 35 g/day of alcohol or less | 1976 | 180/5685 | 0.032 | 446 | 31/1296 | 0.024 |
| Drink >35 g alcohol/day | 364 | 30/1054 | 0.028 | 7 | 2/19 | 0.104 |
| Health check-up | ||||||
| Yes: in last 2–3 years | 2685 | 251/7695 | 0.033 | 2472 | 224/7114 | 0.031 |
| Yes: 4+ years ago | 597 | 111/1630 | 0.068 | 333 | 43/939 | 0.046 |
| Never | 684 | 117/1884 | 0.062 | 699 | 152/1850 | 0.082 |
| Relative deprivation defined by geographical area (municipality) of residence (ranges ×1000) | ||||||
| Quartile 1 (0–284) | 1039 | 99/2980 | 0.033 | 871 | 114/2437 | 0.047 |
| Quartile 2 (285–610) | 1059 | 124/3014 | 0.041 | 835 | 75/2399 | 0.031 |
| Quartile 3 (611–1055) | 1090 | 135/3063 | 0.044 | 848 | 91/2415 | 0.038 |
| Quartile 4 (1056–2579) | 873 | 146/2400 | 0.061 | 1058 | 152/2965 | 0.051 |
| Mean (SD) | 702 (534) | 813 (639) | ||||
| Relative deprivation defined by age group (ranges ×1000) | ||||||
| Quartile 1 (0–274) | 1053 | 93/3035 | 0.031 | 916 | 112/2577 | 0.043 |
| Quartile 2 (275–563) | 1092 | 142/3076 | 0.046 | 788 | 79/2248 | 0.035 |
| Quartile 3 (564–1023) | 1042 | 116/2956 | 0.039 | 839 | 83/2403 | 0.035 |
| Quartile 4 (1024–2370) | 874 | 153/2389 | 0.064 | 1069 | 158/2989 | 0.053 |
| Mean (SD) | 705 (534) | 818 (642) | ||||
| Relative deprivation defined by educational attainment (ranges ×1000) | ||||||
| Quartile 1 (0–292) | 1007 | 105/2880 | 0.036 | 894 | 122/2490 | 0.049 |
| Quartile 2 (293–631) | 995 | 114/2828 | 0.040 | 786 | 67/2265 | 0.030 |
| Quartile 3 (632–1031) | 1149 | 131/3256 | 0.040 | 817 | 88/2334 | 0.038 |
| Quartile 4 (1032–2706) | 878 | 150/2405 | 0.062 | 1080 | 149/3031 | 0.049 |
| Mean (SD) | 696 (521) | 789 (626) | ||||
*100 yen = US$0.95 in September 2008.