Table 1

 Physical characteristics of female swimmers and control girls

VariableSwimmingControl
Values are mean (SD) with range, or n.
*Significant difference between swimmers and controls (p<0.05).
n6171
Age (years)*15.9 (4.9)15.0 (4.0)
(8.6 to 26.5)(8.5 to 24.4)
Mass (kg)49.68 (12.27)50.71 (12.44)
(26.60 to 69.45)(23.10 to 76.10)
Height (cm)*159.1 (12.1)155.2 (11.9)
(129.5 to 182.0)(125.0 to 176.0)
BMI (kg/m2)19.3 (2.8)20.7 (3.1)
(13.7 to 25.8)(14.8 to 27.1)
BMI (centile)*40.7 (2.8)57.4 (25.1)
(4.7 to 85.8)(4.8 to 98.7)
Body fat (%)*18.3 (4.2)22.3 (5.4)
(12.0 to 31.3)(13.3 to 49.6)
Fat-free mass (kg)*40.3 (9.0)34.5 (7.8)
(22.7 to 56.5)(18.4 to 52.5)
Years since menarche5.2 (4.0)4.5 (2.9)
Tanner stage 1, n1712
Tanner stage 2, n413
Tanner stage 3, n1410
Tanner stage 4, n1017
Tanner stage 5, n1619