Table 1. Study Population.

From: Particulate Matter and Incident Chronic Kidney Disease in Japan: The Ibaraki Prefectural Health Study (IPHS)

Particulate matter concentration (mean, range, μg/m3) First quartile
19.9 (19.6-20.0)
Second quartile
20.3 (20.1-20.8)
Third Quartile
22.2 (21.1-25.0)
Fourth Quartile
28.9 (26.5-31.8)
Men
Population at risk Persons 5,350 7,307 6,053 9,695
Age years 60 ± 10 60 ± 10 60 ± 10 60 ± 10
Body mass index kg/m2 23.3 ± 3.0 23.2 ± 2.9 23.2 ± 2.9 23.2 ± 3.0
Systolic blood pressure mmHg 135 ± 18 135 ± 18 136 ± 17 137 ± 17
Diastolic blood pressure mmHg 79 ± 11 80 ± 11 81 ± 11 82 ± 11
Use of antihypertensive drugs % 19.0 18.1 19.4 19.6
Use of hypoglycemic drugs % 5.7 3.6 3.7 3.7
Total cholesterol mg/dl 193 ± 35 193 ± 35 190 ± 35 193 ± 35
High-density lipoprotein mg/dl 54.1 ± 15.5 54.1 ± 15.5 54.1 ± 15.5 54.1 ± 15.5
Triglyceride mg/dl 142 ± 97 151 ± 97 151 ± 97 151 ± 97
Use of lipid-lowering drugs % 0.9 1.3 1.4 1.1
Current smoking % 49.1 50.6 51.4 53.6
Daily alcohol drink % 50.7 50.1 53.6 57.5
Women      
Population at risk Persons 8,689 11,806 11,030 17,840
Age Years 56 ± 10 56 ± 10 56 ± 10 56 ± 10
Body mass index kg/m2 23.5 ± 3.1 23.6 ± 3.2 23.5 ± 3.2 23.4 ± 3.2
Systolic blood pressure mmHg 130 ± 18 130 ± 18 131 ± 18 131 ± 18
Diastolic blood pressure mmHg 77 ± 11 77 ± 10 78 ± 11 78 ± 11
Use of antihypertensive drugs % 16.1 16.3 15.9 16.6
Use of hypoglycemic drugs % 1.7 2.0 2.0 1.7
Total cholesterol mg/dl 205 ± 35 209 ± 35 205 ± 35 205 ± 35
High-density lipoprotein mg/dl 58.0 ± 15.5 58.0 ± 15.5 58.0 ± 15.5 58.0 ± 15.5
Triglyceride mg/dl 133 ± 71 133 ± 80 133 ± 80 124 ± 80
Use of lipid-lowering drugs % 2.9 3.0 2.7 2.9
Current smoking % 3.8 4.7 5.9 5.1
Daily alcohol drink % 3.4 2.9 4.0 4.2
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