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Table 1 General characteristics of a population-based sample of Italian secondary school girls

From: Menstrual pattern and menstrual disorders among adolescents: an update of the Italian data

   Age at data collection
  Whole sample <=14 years 15 16 17 18 19 > = 20 p for trend
n 4892 301 501 1335 1433 952 258 107  
Weight (kg) 55.5 ± 7.6 53.3 ± 8.1 54.5 ± 7.8 55.4 ± 7.0 55.5 ± 7.6 55.7 ± 7.6 56.7 ± 8.3 56.8 ± 8.9 <0.0001
Height (cm) 165.5 ± 6.1 163.4 ± 5.8 165.1 ± 6.1 165.7 ± 5.9 165.6 ± 6.2 165.9 ± 6.1 165.8 ± 6.5 164.7 ± 6.7 <0.0001
BMI (kg/m3) 20.3 ± 2.5 20.0 ± 2.7 20.4 ± 2.6 20.2 ± 2.3 20.3 ± 2.5 20.2 ± 2.4 20.7 ± 2.8 21.0 ± 2.9 0.01
Family size (n°) 2.0 ± 0.7 1.9 ± 0.7 2.1 ± 0.7 1.9 ± 0.7 1.9 ± 0.7 1.9 ± 0.7 2.0 ± 0.7 2.0 ± 0.7 0.12
Smoking habit (%) 32.6 19.3 26.8 26.7 35.8 39.3 43.8 42.1 <0.0001
Alcohol drinking (%) 55.0 38.2 46.1 51.2 59.3 62.7 58.5 56.1 <0.0001
Physical activity (%) 50.0 57.8 57.9 56.2 50.0 39.4 36.8 39.3 <0.0001
Previously on pill (%) 22.0 12.3 21.4 15.3 21.8 28.6 38.8 40.2 <0.0001
Currently on pill (%) 12.6 2.3 5.6 7.6 12.9 20.2 29.1 25.2 <0.0001
 for contraception (%) 8.7 1.0 3.6 4.9 9.0 13.5 21.7 21.5 <0.0001
 for cycle regularity (%) 4.8 1.3 2.4 2.8 5.3 7.7 10.5 5.6 <0.0001
Age at menarche (years) 12.4 ± 1.3 12.1 ± 1.1 12.3 ± 1.3 12.3 ± 1.2 12.5 ± 1.3 12.5 ± 1.3 12.6 ± 1.5 12.6 ± 1.6 <0.0001
Mother’s age at menarche (years) 12.7 ± 1.6 12.6 ± 1.5 12.8 ± 1.7 12.6 ± 1.5 12.7 ± 1.6 12.8 ± 1.6 12.8 ± 1.8 12.9 ± 1.6 0.07