TABLE 1.
Characteristics of the participants by tertile categories of plasma 25(OH)D in the Framingham Offspring Study1
| Plasma 25(OH)D tertile category
|
||||
|---|---|---|---|---|
| T1 | T2 | T3 | P-trend | |
| Participants, n (%) | 270 (33.4) | 268 (33.2) | 270 (33.4) | |
| Plasma 25(OH)D, nmol/L | 30.2 (5.5–38.6) | 46.2 (38.7–53.2) | 63.5 (53.4–127.3) | |
| Age, y | 59.1 ± 9.2 | 59.5 ± 9.2 | 60.2 ± 9.2 | 0.03 |
| Women, n (%) | 140 (51.9) | 130 (48.5) | 136 (50.4) | 0.93 |
| Waist circumference,2cm | 100.7 ± 13.0 | 98.6 ± 12.9 | 94.9 ± 12.8 | <0.001 |
| BMI,2kg/m2 | 28.8 ± 5.1 | 28.1 ± 5.1 | 26.7 ± 5.1 | <0.001 |
| Current smoker,2n (%) | 41 (15.0) | 29 (10.8) | 22 (8.3) | <0.001 |
| Alcohol intake,2g/d | 11.8 ± 15.4 | 9.5 ± 15.2 | 10.1 ± 15.1 | 0.13 |
| Total energy intake,2kJ/d | 8057 ± 3098 | 8119 ± 3041 | 7715 ± 3042 | 0.43 |
| Calcium intake,3mg/d | 852 ± 473 | 1069 ± 465 | 1164 ± 465 | <0.001 |
| Vitamin D intake,3μg/d | 7.8 ± 7.4 | 11.9 ± 7.2 | 13.5 ± 7.2 | <0.001 |
| Vitamin D supplement user, n (%) | 73 (26.8) | 148 (55.5) | 168 (62.2) | <0.001 |
| Physical activity score,2MET-hours/d | 37.1 ± 6.7 | 38.0 ± 6.7 | 37.6 ± 6.9 | 0.28 |
1
Values are means ± SD, n (%), or medians (range).
2
Adjusted for age and sex.
3
Adjusted for age, sex, and total energy intake.