Table 1. Baseline characteristics in the Ohasama Study, Japan, 1998.
| Variables, n (%) | Total n = 2065 |
Age category |
P value | |
|---|---|---|---|---|
| 60–74 years n = 1502 |
≥ 75 years n = 563 |
|||
| Men | 840 (40.7) | 648 (43.1) | 192 (34.1) | <0.001 |
| Body mass index | <0.001 | |||
| <18.5 kg/m2 | 98 (5.6) | 55 (4.1) | 43 (10.8) | |
| 18.5.24.9 kg/m2 | 1134 (65.1) | 870 (64.6) | 264 (66.5) | |
| ≥ 25.0 kg/m2 | 511 (29.3) | 421 (31.3) | 90 (22.7) | |
| Hypertension | 965 (46.7) | 656 (43.7) | 309 (54.9) | <0.001 |
| Diabetes mellitus | 262 (12.7) | 198 (13.2) | 64 (11.4) | 0.27 |
| Hypercholesterolemia | 266 (12.9) | 205 (13.7) | 61 (10.8) | 0.089 |
| Heart disease | 219 (10.6) | 133 (8.9) | 86 (15.3) | <0.001 |
| Kidney disease | 66 (3.2) | 38 (2.5) | 28 (5.0) | 0.005 |
| Smoking status | <0.001 | |||
| Current smoker | 337 (16.3) | 283 (18.8) | 54 (9.6) | |
| Former smoker | 211 (10.2) | 158 (10.5) | 53 (9.4) | |
| Never smoker | 1517 (73.5) | 1061 (70.6) | 456 (81.0) | |
| Current drinker | 648 (31.4) | 519 (34.6) | 129 (22.9) | <0.001 |
| Married | 1283 (70.7) | 1058 (79.7) | 225 (46.1) | <0.001 |
| Educational attainment, junior high school | 1579 (84.8) | 1148 (83.1) | 431 (89.8) | <0.001 |
| Habitual exercise | 0.030 | |||
| ≥ 3 hours/week | 172 (9.6) | 129 (9.7) | 43 (9.4) | |
| 1.2 hours/week | 286 (16.0) | 230 (17.3) | 56 (12.2) | |
| Rarely/Never | 1329 (74.4) | 969 (73.0) | 360 (78.4) | |
| Parental history of hypertension | 377 (18.3) | 303 (20.2) | 74 (13.1) | <0.001 |
| Parental history of stroke | 566 (27.4) | 436 (29.0) | 130 (23.1) | 0.007 |
Values are the number of participants (%). Values for body mass index, marital status, educational attainment, and habitual exercise were available for 1743, 1816, 1862, and 1787 participants, respectively. P denotes the significance of the difference between age categories using the chi-square test.