Table 3.
Age-Standardized Baseline Characteristics of Participants According to Frequency of Acetaminophen Use, Nurses' Health Study II, 1995a
| Frequency of Acetaminophen Use, days/week |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| <1 (n = 20,518) |
1 (n = 25,429) |
2–3 (n = 6,145) |
4–5 (n = 1,133) |
≥6 (n = 969) |
||||||
| Mean (SD) | %b | Mean (SD) | % | Mean (SD) | % | Mean (SD) | % | Mean (SD) | % | |
| Age, yearsc | 40.6 (4.6) | 39.6 (4.7) | 40.0 (4.6) | 40.7 (4.7) | 41.9 (4.3) | |||||
| Body mass indexd | 25.3 (5.7) | 25.5 (5.6) | 26.3 (6.1) | 27.5 (6.8) | 27.5 (7.4) | |||||
| Physical activitye in 1997, METs | 19.6 (23.7) | 18.0 (21.6) | 17.1 (20.7) | 15.6 (18.7) | 15.8 (19.4) | |||||
| Smoking status | ||||||||||
| Never smoker | 66.7 | 68.6 | 66.3 | 64.0 | 60.9 | |||||
| Past smoker | 23.5 | 22.4 | 23.7 | 24.8 | 23.8 | |||||
| Current smoker, cigarettes/day | ||||||||||
| 1–4 | 1.9 | 1.7 | 1.7 | 2.6 | 1.0 | |||||
| 5–14 | 2.9 | 2.8 | 3.1 | 3.3 | 4.2 | |||||
| ≥15 | 4.8 | 4.2 | 5.1 | 5.2 | 9.7 | |||||
| Alcohol consumption, g/day | 3.8 (6.9) | 3.3 (6.3) | 3.2 (6.0) | 3.0 (6.4) | 3.7 (8.9) | |||||
| Daily nutrient intake | ||||||||||
| Vitamin B12, µg | 10.3 (17.1) | 9.7 (12.1) | 9.9 (11.9) | 11.3 (38.7) | 10.4 (13.4) | |||||
| Folate, µg | 472.0 (289.6) | 452.9 (268.4) | 450.4 (264.5) | 445.5 (258.8) | 458.6 (275.0) | |||||
| Potassium, mg | 3,155.3 (655.7) | 3,103.9 (620.7) | 3,059.1 (625.3) | 3,036.6 (619.3) | 3,016.1 (741.6) | |||||
| Magnesium, mg | 340.2 (90.0) | 329.0 (82.9) | 326.3 (84.1) | 322.1 (76.5) | 324.8 (107.0) | |||||
| Vitamin A, IU | 15,083 (10,914) | 14,010 (9,387) | 13,621 (9,052) | 13,816 (9,044) | 13,447 (9,275) | |||||
| History of hypertension | 8.0 | 8.4 | 11.4 | 14.2 | 17.5 | |||||
| History of diabetes | 1.2 | 1.1 | 1.2 | 2.2 | 2.4 | |||||
| Non-Hispanic white race | 92.8 | 93.6 | 93.3 | 94.8 | 93.1 | |||||
Abbreviations: METs, metabolic equivalents; SD, standard deviation.
a Data were standardized to the age distribution of the study population.
b Percentages for smoking may not add up to 100% because of missing information.
c Values were not age-adjusted.
d Weight (kg)/height (m)2.
e Recreational and leisure-time activity.