98.The Committee is deeply concerned about the lack of even basic and disaggregated data on, inter alia, the number and nature of offences committed by children, the use and the average duration of pretrial detention, the number of children dealt with by resorting to measures other than judicial proceedings (diversion), the number of convicted children and the nature of the sanctions imposed on them. The Committee urges the States parties to systematically collect disaggregated data relevant to the information on the practice of the administration of juvenile justice, and necessary for the development, implementation and evaluation of policies and programmes aiming at the prevention and effective responses to juvenile delinquency in full accordance with the principles and provisions of CRC.