The distribution of age at menarche in a random series of Turin girls followed longitudinally.
A longitudinal study on 508 girls chosen at random from the elementary schools of Turin showed that age at menarche had a Gaussian distribution. The mean age was 12.58 +/- 0.05 years. Peaks of incidence of menarche were observed in January and July-September. The correlation coefficient of mothers' (recollected) age at menarche with daughters' was 0.32.
Benso
L
L
Istituto di Discipline Pediatriche, University of Turin.
Lorenzino
C
C
Pastorin
L
L
Barotto
M
M
Signorile
F
F
Mostert
M
M
D000293:Adolescent; D000367:Age Factors; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007558:Italy; D008137:Longitudinal Studies; D008572:Menarche / Q000502:physiology*; D009034:Mother-Child Relations; D011897:Random Allocation; D014505:Urban Population / Q000706:statistics & numerical data*