Table 1.
Demographic Characteristics of a Cohort of Actively Employed US Aluminum Workers at the Start of Follow-up, Stratified by Facility Type, 1998–2012
| Characteristic | Smelting Facilities |
Fabrication Facilities |
||||||
|---|---|---|---|---|---|---|---|---|
| No. | % | Mean (SD) | Median (Range) | No. | % | Mean (SD) | Median (Range) | |
| No. of workers | 5,555 | 7,394 | ||||||
| Person-years | 35,554 | 48,119 | ||||||
| Length of follow-up, years | 6.73 (4.35) | 6.93 (4.60) | ||||||
| No. of IHD cases | 347 | 6.2 | 525 | 7.1 | ||||
| Year of hire | 1989 (1944–2010) | 1989 (1949–2010) | ||||||
| Male sex | 5,250 | 94.5 | 5,962 | 80.6 | ||||
| White race | 4,778 | 86.0 | 6,064 | 82.0 | ||||
| Age, years | 43.19 (10.19) | 44.10 (9.93) | ||||||
| Body mass indexa | 29.29 (5.11) | 29.60 (5.57) | ||||||
| Smoking statusa | ||||||||
| Current | 27.2 | 27.4 | ||||||
| Ever | 34.6 | 30.3 | ||||||
| Diabetes | 313 | 5.6 | 429 | 5.8 | ||||
| Hypertension | 1,025 | 18.5 | 1,229 | 16.6 | ||||
| Dyslipidemia | 968 | 17.4 | 1,234 | 16.7 | ||||
| Risk score | 0.85 (0.15–54.98) | 0.90 (0.15–51.07) | ||||||
Abbreviations: IHD, ischemic heart disease; SD, standard deviation.
a Body mass index (weight (kg)/height (m)2) data were available for approximately 70% of the study population, and smoking status data were available for 40%. The values presented here are based only on the available data.