Table 2 Baseline characteristics of the 1161 women grouped by household income
Household income (million Japanese yen/year) [(thousand US dollars/year)] | |||||
|---|---|---|---|---|---|
<5.0 | 5.0–7.9 | 8.0–9.9 | ≥10.0 | ||
[<60.8] | [60.8–97.2] | [97.3–121.6] | [≥121.7] | ||
n = 488 | n = 359 | n = 156 | n = 158 | P value | |
Age (years) | 35.8 ± 10.6 | 40.1 ± 8.9 | 40.2 ± 8.9 | 39.7 ± 8.6 | <0.001 |
Systolic blood pressure (mmHg) | 108.0 ± 11.8 | 109.3 ± 12.5 | 110.0 ± 12.0 | 109.1 ± 10.6 | 0.289 |
Diastolic blood pressure (mmHg) | 65.9 ± 9.0 | 66.9 ± 9.7 | 66.8 ± 8.9 | 66.5 ± 9.3 | 0.465 |
Type of occupation | <0.001 | ||||
Managers | 1 (0.2%) | 8 (2.2%) | 5 (3.2%) | 12 (7.6%) | |
Professionals | 65 (13.3%) | 56 (15.6%) | 24 (15.4%) | 49 (31.0%) | |
Technicians | 27 (5.5%) | 17 (4.7%) | 5 (3.2%) | 6 (3.8%) | |
Clerks | 165 (33.8%) | 116 (32.3%) | 56 (35.9%) | 56 (35.4%) | |
Service and sales workers | 9 (1.8%) | 4 (1.1%) | 1 (0.6%) | 1 (0.6%) | |
Craft and related trade workers | 15 (3.1%) | 10 (2.8%) | 2 (1.3%) | 3 (1.9%) | |
Machine operators | 20 (4.1%) | 21 (5.9%) | 5 (3.2%) | 2 (1.3%) | |
Laborers | 94 (19.3%) | 59 (16.4%) | 25 (16.0%) | 16 (10.1%) | |
Others | 92 (18.9%) | 68 (18.9%) | 33 (21.2%) | 13 (8.2%) | |
Number of family members | 2 (1–9) | 3 (1–8) | 3 (1–7) | 3 (1–8) | <0.001 |
Smoking habit | 0.098 | ||||
Never | 421 (86.3%) | 320 (89.1%) | 136 (87.2%) | 142 (89.9%) | |
Ex-smoker | 29 (5.9%) | 9 (2.5%) | 3 (1.9%) | 5 (3.2%) | |
Current smoker | 38 (7.8%) | 30 (8.4%) | 17 (10.9%) | 11 (7.0%) | |
Alcohol drinking habit | 0.249 | ||||
Nondrinker | 258 (52.9%) | 205 (57.1%) | 86 (55.1%) | 74 (46.8%) | |
Occasional drinker | 181 (37.1%) | 112 (31.2%) | 46 (29.5%) | 63 (39.9%) | |
Light daily drinker | 36 (7.4%) | 35 (9.7%) | 19 (12.2%) | 17 (10.8%) | |
Heavy daily drinker | 13 (2.7%) | 7 (2.0%) | 5 (3.2%) | 4 (2.5%) | |
Body mass index | 0.127 | ||||
<25 kg/m2 | 454 (93.0%) | 324 (90.3%) | 139 (89.1%) | 144 (91.1%) | |
≥25 kg/m2 | 34 (7.0%) | 35 (9.7%) | 17 (10.9%) | 14 (8.9%) | |
Diabetes | 4 (0.8%) | 3 (0.8%) | 3 (1.9%) | 4 (2.5%) | 0.287 |
Hypercholesterolemia | 55 (11.3%) | 70 (19.5%) | 29 (18.6%) | 21 (13.3%) | 0.014 |
