Table 1.
Unweighteda characteristics of 12- to 19-year-old participants (n = 848) in the 2011-2016 NHANES, overall and by total body less head aBMD Z-score quartiles
| aBMD Z-score quartilesb | |||||
|---|---|---|---|---|---|
| Total (N = 848) | Q1 (N = 212) | Q2 (N = 212) | Q3 (N = 212) | Q4 (N = 212) | |
| Mean ± SD or N (%) | |||||
| Age, y | 15 ± 2.1 | 15 ± 2.1 | 15 ± 2.2 | 15 ± 2.1 | 15 ± 2.0 |
| Female | 395 (47%) | 97 (46%) | 101 (48%) | 101 (48%) | 96 (45%) |
| Race/ethnicity | |||||
| Mexican American | 199 (23%) | 42 (20%) | 49 (23%) | 51 (24%) | 57 (27%) |
| Other Hispanic | 94 (11%) | 20 (9%) | 22 (10%) | 27 (13%) | 25 (12%) |
| Non-Hispanic White | 225 (27%) | 67 (32%) | 58 (27%) | 54 (25%) | 46 (22%) |
| Non-Hispanic Black | 198 (23%) | 47 (22%) | 51 (24%) | 52 (25%) | 48 (23%) |
| Non-Hispanic Asian | 89 (10%) | 27 (13%) | 21 (10%) | 21 (10%) | 20 (9%) |
| Other/multi-racial | 43 (5%) | 9 (4%) | 11 (5%) | 7 (3%) | 16 (8%) |
| Physical activity, hours per week | 5.9 ± 7.3 | 4.1 ± 5.5 | 5.4 ± 7.4 | 6.6 ± 7.6 | 7.3 ± 8.1 |
| Household member smokes indoors | 109 (13%) | 26 (12%) | 25 (12%) | 28 (13%) | 30 (14%) |
| Total dairy, cups | 1.8 ± 1.6 | 1.6 ± 1.3 | 1.9 ± 1.6 | 1.9 ± 1.6 | 1.9 ± 1.7 |
| Sugar-sweetened beverages, cups | 0.87 ± 1.5 | 0.85 (± 1.4) | 0.76 (± 1.2) | 1.0 (± 2.1) | 0.83 (± 1.3) |
| NHANES cycle | |||||
| 2011-2012 | 258 (30%) | 63 (30%) | 81 (38%) | 55 (26%) | 59 (28%) |
| 2013-2014 | 319 (38%) | 74 (35%) | 69 (33%) | 92 (43%) | 84 (40%) |
| 2015-2016 | 271 (32%) | 75 (35%) | 62 (29%) | 65 (31%) | 69 (33%) |
Abbreviations: aBMD, area bone mineral density; NHANES, National Health and Nutrition Examination Survey; Q, quartile.
aModels do not account for the complex sample design, and therefore results cannot be considered generalizable to the US population.
baBMD Z-score quartile minimum and maximum values: Q1: -4.01 to -1.12; Q2: 1.11 to -0.30; Q3: -0.30 to 0.39; Q4: 0.39 to 2.72.