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Table 1 Descriptive variables for Caucasian women (values are mean (standard deviation) unless otherwise stated)

From: The influence of lifestyle, menstrual function and oral contraceptive use on bone mass and size in female military cadets

Variable All Women (n = 107) Women with Normal Cycles (n = 81) Women with Amenorrhea/Oligomenorrhea (n = 25) Women on Oral Contraceptives (n = 12) Women never on Oral Contraceptive (n = 95)
  Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD)
Age 18.4 (± 0.8) 18.4 (± 0.8) 18.6 (± 0.9) 18.6 (± 1.0) 18.4 (± 0.7)
Age of Menarche (years) 12.8 (± 1.2) 12.6 (± 1.1) 13.6 (± 0.9) * 12.5 (± 1.2) 12.9 (± 1.1)
BMI (kg/mg2) 23.0 (± 2.3) 23.3 (± 2.4) 22.6 (± 2.0) 22.8 (± 1.8) 23.2 (± 2.4)
Height (inches) 65.7 (± 2.4) 65.6 (± 2.5) 66.1 (± 1.8) 64.6 (± 3.0) 65.8 (± 2.3)
Weight (pounds) 142 (± 17) 142.4 (± 17.8) 140.6 (± 15.3) 135.3 (± 12.8) 142.6 (± 17.4)
Army Physical Fitness Test (APFT 0–300) 207.8 (± 40.9) 206.0 (± 39.3) 215.1 (± 39.3) 188.3 (± 52.3) 211.8 (± 36.6)
Run score (range 0–100) 74 (± 22) 72.3 (± 22.1) 77.7 (± 22.0) 59.9 (± 25.7) # 76.1 (± 20.9)
Calcium Intake (mg/day) 1074 (± 463) 1167 (± 459) 1014 (± 389) 937 (± 419) 1142 (± 449)
Exercise (hrs/week) %, (n)      
1–3 3.0 (4) 2.9 (3) 3.4 (1) 0 (0) 1 (1)
4–6 19.5 (26) 19.4 (38) 20.7 (6) 41.7 (5) 15.6 (15)
7–10 33.8 (45) 36.9 (24) 24.1 (7) 33.3 (4) 38.5 (37)
11+ 43.6 (58) 40.8 (42) 51.7 (15) 25.0 (3) 44.8 (43)
Milk (glass/day) %, (n)      
0 11.3 (15) 10.7 (11) 13.8 (15) 8.3 (1) 11.5 (11)
<1 29.3 (39) 23.3 (24) 48.3 (14) 25.0 (3) 25.0 (24)
1–2 46.6 (62) 52.4 (54) 27.6 (8) 50.0 (6) 49.0 (47)
3+ 12.8 (17) 13.6 (14) 10.3 (3) 16.7 (2) 14.6 (14)
Caffeinated Drink/Day %, (n)      
None 24.1(32) 22.3 (23) 27.6 (8) 33.3 (4) 20.8 (20)
1–3 69.2 (92) 70.9 (73) 65.5 (19) 58.3 (7) 70.8 (68)
3+ 6.8 (9) 6.8 (7) 6.9 (2) 8.3 (1) 8.3 (8)
Alcohol Consumption %, (n)      
Less than once a month 66.9 (91) 70.9 (73) 55.2 (16) 66.7 (8) 64.6 (62)
1–3 times a month 21.3 (28) 18.4 (19) 34.5 (10) 16.7 (2) 24.0 (23)
1–2 times a week 8.8 (12) 8.7 (9) 10.3 (3) 8.3 (1) 11.5 (11)
>3 times a week 1.5 (2) 1.9 (2) 0.0 (0) 8.3 (1) 0 (0)
Smokers %, (n) 3.0 (4) 2.9 (3) 3.4 (1) 8.3 (1) 2.2 (2)
History of Fracture (% yes); n 34.1 (46) 38.8 (40) 24.1 (7) 33.3 (4) 37.5 (36)
  1. * p < 0.05 versus women with normal cycles
  2. # p < 0.05 versus women never on oral contraceptives