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 menarche | Definition of irregular menstrual cycles |
|---|---|
Less than 1 year post menarche | Irregular 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) |