Table 2.

Bone mineral density at baseline, after 12-months and mean of difference within groups according to resistance training participation (n = 91)

Variables	Impact sports + RT (n = 21)	Impact sports only (n = 45)	Swimming + RT (n = 8)	Swimming only (n = 17)
Crude aBMD (g/cm2)	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
Upper limbs
Baseline	0.827 (0.114)	0.798 (0.116)	0.865 (0.066)	0.750 (0.115)
Follow-up	0.901 (0.106)	0.859 (0.103)	0.927 (0.069)	0.812 (0.080)
Mean of change	0.074 (0.055)	0.062 (0.050)	0.062 (0.021)	0.062 (0.052)
Mean of change adjusted#	0.077 (0.055 to 0.099)	0.060 (0.046 to 0.074)	0.096 (0.074 to 0.118)	0.046 (0.032 to 0.060)
Lower limbs
Baseline	1.299 (0.158)	1.259 (0.181)	1.234 (0.119)	1.127 (0.135)
Follow-up	1.352 (0.144)	1.348 (0.178)	1.277 (0.119)	1.192 (0.130)
Mean of change	0.053 (0.043)	0.089 (0.056)	0.043 (0.019)	0.065 (0.036)
Mean of change adjusted#	0.066 (0.043 to 0.088)	0.084 (0.069 to 0.098)	0.054 (0.032 to 0.078)	0.060 (0.045 to 0.074)
Spine
Baseline	1.120 (0.152)	1.019 (0.141)	1.133 (0.082)	0.974 (0.150)
Follow-up	1.148 (0.137)	1.057 (0.137)	1.063 (0.088)	0.939 (0.125)
Mean of change	0.028 (0.064)	0.038 (0.052)	-0.069 (0.062)	-0.035 (0.059)
Mean of change adjusted#	0.039 (0.015 to 0.064)	0.033 (0.017 to 0.049)	-0.045 (-0.085 to -0.004)	-0.047 (-0.073 to -0.021)
WBLH
Baseline	1.077 (0.123)	1.041 (0.134)	1.057 (0.083)	0.951 (0.112)
Follow-up	1.131 (0.114)	1.105 (0.130)	1.072 (0.088)	0.979 (0.085)
Mean of change	0.054 (0.041)	0.064 (0.042)	0.015 (0.018)	0.028 (0.036)
Mean of change adjusted#	0.065 (0.047 to 0.082)	0.059 (0.048 to 0.071)	0.039 (0.024 to 0.054)	0.017 (0.007 to 0.026)

RT = Resistance training; SD = standard deviation; aBMD = areal bone mineral density; # results presented in mean and 95% confidence interval and from GLM model of comparisons between groups (sport alone vs. sport + RT) adjusted by maturity offset, sex, and aBMD of each segment at baseline