Table 1.
Selected baseline characteristics of the analytic sample: number (percent) or mean (standard deviation)
| Study sample (n=2,167) |
SWAN Bone Cohor (n=2,413) |
|
|---|---|---|
| Age, years | 45.8 (2.7) | 45.8 (2.7) |
| Body mass index, kg/m2 | 27.9 (7.5) | 28.0 (7.5) |
| Alcohol intake, weekly | ||
| None | 1,118(51.6) | 1,244 (51.8) |
| ≤ 1 drink/week | 202 (9.3) | 220 (9.2) |
| 1 <drinks/week<7 | 553 (25.5) | 607 (25.3) |
| ≥ 7 drinks/week | 294 (13.6) | 332 (13.8) |
| Race/ethnicitya | ||
| African-American | 592 (27.3 %) | 686 (28.4 %) |
| Caucasian | 1,093 (50.4 %) | 1,196(49.6 %) |
| Chinese | 223 (10.3 %) | 250 (10.4 %) |
| Japanese | 259 (11.9 %) | 281 (11.6 %) |
| Menopausal stage | ||
| Premenopausal | 1,181 (54.5 %) | 1,288(54.1 %) |
| Early perimenopausal | 986 (45.5 %) | 1,094 (45.9 %) |
| Smoking statusa | ||
| Never | 1259(58.1 %) | 1,383 (57.8 %) |
| Past | 575 (26.5 %) | 619 (25.8 %) |
| Current | 333 (15.4 %) | 393 (16.4 %) |
| Smoking pack-years | ||
| ≤ 10 | 1,726 (79.6 %) | 1,903 (78.9 %) |
| >10 but ≤20 | 197 (9.1 %) | 229 (9.5 %) |
| ≥20 | 244 (11.3 %) | 281 (11.7 %) |
| Routine use of vitamin D supplementa |
843 (38.9 %) | 917 (38.2 %) |
| Routine use of calcium supplementa |
980 (44.2 %) | 1,066 (44.4 %) |
| Prevalent fracture (before baseline) |
415 (19.1 %) | 457 (18.9 %) |
| Total physical activity score without work |
7.8 (1.8) | 7.8 (1.8) |
| Maximum educational level attainedb | ||
| High school or less | 459 (21.3 %) | 524 (21.9 %) |
| Some college | 728 (33.8 %) | 815 (34.0 %) |
| Completed college | 464 (21.5 %) | 509 (21.2 %) |
| At least some postgraduate | 503 (23.4 %) | 548 (22.9 %) |
| Difficulty paying for basicsa,c | ||
| Very hard | 162 (7.5 %) | 197 (8.2 %) |
| Somewhat hard | 587 (27.2 %) | 660 (27.5 %) |
| Not very hard at all | 1,410 (65.3 %) | 1,547 (64.3 %) |
| Total household income in the past yeara | ||
| <$10,000 | 96 (4.5 %) | 117(5.0 %) |
| $10,000 to $19,999 | 144 (76.8 %) | 178 (7.6 %) |
| $20,000 to $34,999 | 340 (16.1 %) | 379 (16.1 %) |
| $35,000 to $49,999 | 404 (19.1 %) | 449 (19.1 %) |
| $50,000 to $74,999 | 511 (24.2 %) | 556 (23.7 %) |
| $75,000 to $99,999 | 285 (13.5 %) | 310(13.2 %) |
| $100,000 to $149,999 | 240 (11.4 %) | 256 (10.9 %) |
| $150,000 or more | 93 (4.4 %) | 103 (4.4 %) |
| Family-adjusted poverty-to- income ratioa,d |
3.1 (2.9) | 3.1 (2.9) |
a
Statistically significant difference between the analytic sample participants and the excluded participants
b
Information was available for 2,154 participants
c
Information was available for 2,159 participants
d
Information was available for 2,112 participants. Information is presented as median (interquartile range)