Inclusion Criteria:  Women 23-40 years of age First record of CIN2 verified diagnosis (M74B09, T83110) Managed by active surveillance (i.e. no surgical treatment within 4 months after index CIN2 diagnosis) Record of CIN2 diagnosis during 2000-2010 and at least one record of cervix histological sample during follow-up.  Exclusion Criteria:  Prior record of CIN2+ (i.e. CIN2, CIN3, cervical cancer), hysterectomy or cervical excisional cone biopsy. No record of cervical histological sample (cervical punch biopsy of cervical excisional biopsy) within two years after index CIN2 diagnosis.