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Table 2 Association between obesity according to Fat Mass Index (FMI) from 18 to 22 years on bone mineral density (g/cm2) at 22 years of age

From: Associations between body mass index, body composition and bone density in young adults: findings from a southern Brazilian cohort

Variable Men (N = 1408)
N Whole Body Lumbar Spine Femoral Neck
Mean Adjusteda Mean Adjusteda Mean Adjusteda
(95% CI) β (95% CI) (95% CI) β (95% CI) (95% CI) β (95% CI)
Obesity by FMI    0.332   0.140   0.088
Never 1139 1.263 Reference 1.232 Reference 1.169 Reference
(1.257; 1.268) (1.224; 1.241) (1.159; 1.179)
Only at 18 years 28 1.297 0.008 1.304 0.007 1.188 0.021
(1.263; 1.331) (−0.020; 0.005) (1.251; 1.357) (−0.016; 0.031) (1.128; 1.249) (−0.013; 0.055)
Only at 22 years 158 1.300 0.002 1.249 −0.007 1.204 0.015
(1.286; 1.313) (−0.004; 0.008) (1.228; 1.270) (−0.017; 0.004) (1.179; 1.228) (−0.001; 0.030)
Always 83 1.313 0.005 1.242 −0.014 1.208 0.018
(1.295; 1.331) (−0.003; 0.012) (1.216; 1.268) (−0.029; − 0.001) (1.175; 1.241) (− 0.003; 0.038)
Variable Women (N = 1560)
N Whole Body Lumbar Spine Femoral Neck
Mean Adjusteda Mean Adjusteda Mean Adjusteda
(95% CI) β (95% CI) (95% CI) β (95% CI) (95% CI) β (95% CI)
Obesity by FMI    <0.001   0.339   0.001
Never 1208 1.142 Reference 1.185 Reference 1.007 Reference
(1.138; 1.146) (1.178; 1.192) (1.000; 1.014)
Only at 18 years 23 1.183 −0.013 1.239 −0.005 1.036 −0.014
(1.153; 1.212) (− 0.023; − 0.002) (1.192; 1.285) (− 0.027; 0.018) (0.989; 1.083) (− 0.042; 0.014)
Only at 22 years 182 1.192 0.013 1.228 0.007 1.080 0.027
(1.182; 1.202) (0.009; 0.017) (1.210; 1.247) (−0.001; 0.016) (1.063; 1.097) (0.016; 0.038)
Always 147 1.236 0.005 1.286 −0.001 1.129 0.006
(1.225; 1.248) (0.001; 0.011) (1.266; 1.305) (−0.012; 0.010) (1.109; 1.149) (−0.008; 0.019)
  1. aAdjusted for perinatal variables (maternal nutritional status, family income, maternal education, gestational age, weight and length), 15 years (skin color), 18 years (smoking, total physical activity score, calcium intake) and 22 years of age (lean mass index)
  2. The 1993 Birth Cohort, Pelotas, Brazil