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

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

N

Mean

Adjusted^a

Mean

Adjusted^a

Mean

Adjusted^a

(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)