Table 1 Baseline characteristics of the communities and participants (2016, Unnan City)
Entire city | High dose groupa | Low dose groupa | |
|---|---|---|---|
Community | 29 | 10 | 19 |
Residents, n | 40,372 | 21,246 | 19,126 |
Residents aged 40–79 years, n | 20,830 | 10,940 | 9890 |
Population density, mean (SD), /km2 | 73.0 | 135.6 | 48.2 |
Evaluation participations (eligible response rate) | 3718/7000 (53.0%) | 1960/3847 (50.9%) | 1758/3153 (55.8%) |
Male | 1776 (47.8%) | 923 (47.1%) | 853 (48.5%) |
Age, mean (SD), years | 62.0 (10.2) | 61.7 (10.4) | 62.3 (10.0) |
40–59 years | 1370 (36.8%) | 722 (36.8%) | 648 (36.9%) |
60–79 years | 2348 (63.2%) | 1238 (63.2%) | 1110 (63.1%) |
Body mass index, mean (SD), kg/m2 | 22.5 (3.1) | 22.6 (3.1) | 22.5 (3.2) |
 < 18.5 | 285 (7.8%) | 153 (7.9%) | 132 (7.6%) |
≧18.5, < 25 | 2683 (73.1%) | 1405 (72.6%) | 1278 (73.7%) |
≧25 | 701 (19.1%) | 377 (19.5%) | 324 (18.7%) |
Self-rated health | |||
Excellent/good | 3130 (86.2%) | 1639 (85.6%) | 1491 (86.8%) |
Fair/poor | 501 (13.8%) | 275 (14.4%) | 226 (13.2%) |
Years of education, mean (SD) | 12.0 (2.3) | 12.2 (2.3) | 11.7 (2.3) |
Employed | 2402 (66.1%) | 1249 (65.0%) | 1153 (67.4%) |
Engagement in farming | 1880 (51.8%) | 849 (44.7%) | 1031 (59.6%) |
Chronic disease historyb | 2209 (59.4%) | 1170 (59.7%) | 1039 (59.1%) |