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Table 1 Characteristics of study subjects at time of DXA

From: Factors associated with low bone density in patients referred for assessment of bone health

Characteristic BMD Z-score ≤ - 2 - 2 < BMD Z-score < -1 BMD Z-score ≥ -1 p
   N =102 N = 101 N = 101  
Female 56 (55%) 63 (62%) 76 (75%) 0.009
Age (years) Mean ± SD 13.6 ± 4.1 14.5 ± 4.3 15.5 ± 3.3 0.003
Race/Ethnicity 0.397
  White 88 (86%) 79 (78%) 83 (82%)  
  Black 1 (1%) 2 (2%) 4 (4%)  
  Hispanic 1 (1%) 4 (4%) 3 (3%)  
  Asian 2 (2%) 4 (4%) 3 (3%)  
  Other 6 (6%) 2 (2%) 3 (3%)  
  Not Documented 4 (4%) 10 (10%) 5 (5%)  
BMI Mean ± SD 18.8 ± 3.6 20.2 ± 4.4 23.1 ± 5.2 <0.001
  Underweight 13 (15%) 9 (9%) 3 (3%) 0.003
Healthy weight 62 (72%) 75 (76%) 65 (67%)  
Overweight 9 (11%) 6 (6%) 16 (17%)  
Obese 2 (2%) 9 (9%) 13 (13%)  
BMI Z-score Mean ± SD -0.43 + 1.0 -0.11 + 1.2 0.52 + 1.0 <0.001
Height Z-score Mean ± SD -1.2 ± 1.5 -0.7 ± 1.3 -0.1 + 1.1 <0.001
Hip Z-score Mean ± SD -2.18 ± 1.1 -1.0 ± 0.6 0.45 ± 0.8 <0.001
Spine Z-score Mean ± SD -2.4 ± 0.9 -1.1 ± 0.6 0.30 ± 0.9 <0.001