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Table 1 Mean (SD) of basic characteristics in girls based on groups of AM (n = 724a)

From: Age at menarche, eating disorders, and their relationships with some parameters in female adolescents in Iran

Variables 1
9 ≤ AM ≤ 12
n = 232
2
12 < AM ≤ 14
n = 437
3
14 < AM ≤ 16
n = 55
Total
Height (cm) 160.40 (5.83) 160.81 (5.58) 161.02 (4.94) 160.69 (5.61)
Weight (kg) 60.03 (10.72)b 57.21 (10.66)b 56.66 (13.39) 58.06 (10.98)
Waist circumference (cm) 74.12 (8.27)c 72.51 (7.87)c 73.08 (8.43) 73.07 (8.06)
Body mass index (kg/m2) 23.32 (3.97)b, d 22.09 (3.83)d 21.84 (4.75)b 22.46 (3.99)
Mothers’ AM (years) 13 (1.47)d 13.65 (1.07)c, d 14.36 (0.99)c, d 13.50 (1.27)
  1. Groups are based on the age at which menstruation was occurred
  2. AM age at menarche
  3. aOne person was ignored because of delayed menarche
  4. bp < 0.01
  5. cp < 0.05
  6. dp < 0.001