Table 1 Control and COC user group characteristics at baseline (median, minimum, and maximum values)

Age (years)

15.63

14.67

16.08

15.75

11.75

19.50

0.533

Bone age (years)

16.00

14.00

18.00

16.50

14.00

18.00

0.604

Weight (Kg)

51.90

42.60

64.70

52.20

41.00

73.40

0.839

Height (m)

1.64

1.51

1.72

1.59

1.49

1.67

0.101

BMI (Kg/m2)

20.02

16.69

24.03

20.88

16.63

27.82

0.233

Z-score for BMI

−0.08

−1.40

0.94

0.26

−1.93

1.94

0.255

BMI (percentile)

47.08

8.07

82.71

60.23

2.66

97.38

0.279

Lumbar BMD (g/cm²)

0.85

0.76

1.12

0.96

0.77

1.09

0.228

Lumbar BMC (g)

46.37

39.90

76.64

49.82

37.70

64.80

0.330

Total body BMD (g/cm²)

1.00

0.86

1.18

1.00

0.85

1.13

0.369

Total body BMC (g)

1783.62

1260.69

2473.26

1831.42

1291.25

2130.32

0.855

Subtotal BMD (g/cm²)

0.88

0.75

1.04

0.87

0.73

0.95

0.503

Subtotal BMC (g)

1320.19

923.07

1860.11

1407.01

945.38

1609.56

0.903

Total body fat (g)

15075.80

9539.10

22160.10

16111.70

8504.00

25681.00

0.976

Lean weight (g)

33051.00

13852.00

40656.80

36735.60

29604.00

47615.70

0.016

Total body fat (%)

30.10

21.10

37.70

29.50

19.60

38.00

0.637