Table 4. Mean and standard deviation of bone mineral density.

		G1CS	G1CN	G1FS	G1FN
BMD	Femur	0.21 ± 0.01	0.20 ± 0.01	0.22 ± 0.02 a, b, c, d	0.21 ± 0.01
	Tibia	0.17 ± 0.01	0.17 ± 0.02	0.18 ± 0.02 a, d	0.17 ± 0.01
		G2CS	G2CN	G2FS	G2FN
BMD	Femur	0.20 ± 0.01	0.19 ± 0.01	0.20 ± 0.01	0.19 ± 0.01
	Tibia	0.16 ± 0.01	0.16 ± 0.01	0.16 ± 0.01	0.16 ± 0.01

G1CS: offspring of breeding female control group, sedentary control; G1CN: offspring of breeding female control group, exercise control group; G1FS: offspring of breeding female control group, exposed to cigarette smoke and sedentary; G1FN: offspring of breeding female control group, exposed to cigarette smoke and exercise; G2CS: offspring of breeding females exposed to cigarette smoke, sedentary control group; G2CN: offspring of breeding females exposed to cigarette smoke, exercise control group; G2FS: offspring of breeding females exposed to cigarette smoke, exposed to cigarette smoke and sedentary; G2FN: offspring of breeding females exposed to cigarette smoke, exposed to cigarette smoke and exercise. Letters indicate statistical difference between: a = G1FS vs. G2CS, b = G1FS vs. G2CN, b = G1FS vs. G2FS, b = G1FS vs. G2FN.