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Table 4 Definition of irregular menstrual cycles in adolescents according to time post menarche

From: Adolescent polycystic ovary syndrome according to the international evidence-based guideline

Time post menarcheDefinition of irregular menstrual cycles
Less than 1 year post menarcheIrregular menstrual cycles are normal pubertal transition
> 1 to < 3 years post menarche< 21 or > 45 days
> 3 years post menarche< 21 or > 35 days or < 8 cycles per year
More than 1 year post menarche> 90 days for any one cycle
 Primary amenorrhoea by age 15 years or > 3 years post thelarche (breast development)