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Table 1 Descriptive statistics for demographics, femoral neck BMD, physical activity, and soft drink availability at home among the three age groups

From: Nutritional factors associated with femoral neck bone mineral density in children and adolescents

Variables

Age groups, yrs

8–11 (n = 1004)

12–15 (n = 725)

16–19 (n = 669)

Demographics

 Race, Non-Hispanic White (%)

329 (59.6)

232 (60.3)

224 (61.8)

 Sex, Males (%)

479 (48.0)

358 (47.2)

1163 (46.5)

 Body weight (mean ± SE, kg)

34.6 ± 0.3

54.9 ± 0.6

64.4 ± 0.6

 Body height (mean ± SE, cm)

139.5 ± 0.4

162.6 ± 0.4

168.9 ± 0.5

 Body mass index (mean ± SE, kg/m2)

17.5 ± 0.1

20.6 ± 0.2

22.5 ± 0.1

 Income, Low-incomea

694 (55.4)

494 (55.5)

412 (49.9)

Femoral neck bone mineral density (BMD) (mean ± SE, g/cm2)

0.709 ± 0.004

0.921 ± 0.004

1.015 ± 0.006

Physical activityb

 Vigorous recreational activities, yes (%)

–

488 (70.3)

372 (57.1)

 Moderate recreational activities, yes (%)

–

380 (59.6)

295 (47.9)

Soft drink availability at homec

 Always

361 (38.3)

280 (37.4)

278 (42.6)

 Most of the time

149 (16)

105 (14.5)

96 (14.1)

 Sometimes

236 (21.3)

182 (22.2)

140 (15.5)

 Rarely

161 (14.9)

112 (17.2)

81 (16.3)

 Never

89 (8.8)

41 (7.9)

63 (9.6)

  1. a Low income: participants with a ratio of family income to poverty < 3.0; otherwise rate ≥ 3.0 indicated high income
  2. b The definition of vigorous and moderate recreational activity was based on the NHANES questionnaire (https://wwwn.cdc.gov/Nchs/Nhanes/2013-2014/PAQ_H.htm) with indicated types and duration of sports
  3. c 24 participants with missing record were not presented