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TL;DR
The central result was a mean menarcheal age of 13.13 years, with girls achieving menarche being significantly older and in higher Tanner stages than those who did not.
Cureus · 7 authors, 3 centres
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The central result was a mean menarcheal age of 13.13 years, with girls achieving menarche being significantly older and in higher Tanner stages than those who did not.
The participants were followed for six months to observe menarche attainment. The mean age of the study population was 12.42 years. During follow-up, 263 girls (56%) achieved menarche, with a mean age of 13.13 years. A review of 19 Indian studies from the 21st century showed a continuing secular decline in menarcheal age, estimated at 0.41 years per decade. The findings suggest Tanner stage is a better indicator of pubertal onset than age.