Table 1 Age-standardized characteristics of the 111,769 study participants at baseline in 1990 with respect to categories of PM 10
From: Particulate matter and risk of parkinson disease in a large prospective study of women
PM10 | ||||
|---|---|---|---|---|
Pollution category | Q1* | Q2 | Q3 | Q4 |
Median PMa | 19.0 | 22.6 | 26.0 | 31.8 |
Age, mean (sd) | 58.2 (7.2) | 58.2 (7.2) | 58.1 (7.2) | 58.2 (7.2) |
Never Smoker (%) | 48.0 | 46.5 | 45.9 | 42.3 |
Pack years, mean (sd) | 12.8 (19.3) | 13.1 (19.4) | 13.0 (19.1) | 13.9 (19.5) |
Caffeine mg/day, mean (sd) | 284.2 | |||
(239.5) | 284.6 | |||
(238.1) | 280.2 | |||
(234.1) | 274.8 | |||
(228.2) | ||||
Ibuprofen ever user (%) | 28.7 | 28.4 | 28.7 | 26.8 |
Census tract incomeb, USD, mean (sd) | 51602.9 | |||
(16926) | 58044.3 | |||
(22510.2) | 66772.3 | |||
(26322.7) | 66,772.3 | |||
(26322.7) | ||||
(Population density)b, (persons/tract), mean, (sd) | 1436.3 | |||
(2184.5) | 2139.3 | |||
(3216.8) | 1922.6 | |||
(3088.5) | 4449.4 | |||
(9575.1) | ||||
Region of US | ||||
‘Northeast Region | 12.2 | 18.5 | 41.8 | 61.2 |
‘Midwest region’, % | 31.8 | 26.2 | 27.2 | 14.7 |
‘West region’, % | 7.0 | 3.5 | 6.7 | 15.9 |
‘South region’, % | 49.0 | 51.8 | 24.3 | 8.2 |