103. Juveniles detained under criminal legislation should, in principle, not be held with juveniles deprived of their liberty on other grounds. Male and female juveniles who are placed in the same institution should be accommodated in separate units, although they may associate for organised activities during the day, under appropriate supervision. Special attention should be paid to the allocation of juveniles belonging to diferent age groups in order to accommodate their needs in the best way. Appropriate measures should also be taken to ensure adequate separation between these age groups in order to prevent unwanted infuence, domination and abuse. The European Rules for young ofenders state that young adult ofenders may, where appropriate, be regarded as juveniles and dealt with accordingly. This practice can be benefcial to the young persons involved but requires careful management to prevent the emergence of negative behaviour. In this respect, the CPT considers that a case-by-case assessment should be carried out in order to decide whether it is appropriate for a particular inmate to be transferred to an adult institution after reaching the age of majority (i.e. 18 years), taking into consideration the remaining term of his/ her sentence, his/her maturity, his/her infuence on other juveniles, and other relevant factors. b. Material conditions 104. A well-designed juvenile detention centre should provide positive and personalised conditions of detention for young persons, respecting their dignity and privacy. All rooms should be appropriately furnished and provide good access to natural light and adequate ventilation. General Report of the CPT, 2013-2014 ► Page 52 Juveniles should normally be accommodated in individual bedrooms; reasons should be provided explaining why it is in the best interests of the juvenile to share sleeping accommodation with another inmate. Juveniles should be consulted before being required to share sleeping accommodation and should be able to state with whom they would wish to be accommodated. Every efort should be made to avoid placing juveniles in large dormitories as the CPT’s experience is that this puts juveniles at a signifcantly higher risk of violence and exploitation. Indeed, establishments with large dormitories should be phased out. 105. Further, juveniles should have ready access to sanitary facilities that are hygienic and respect privacy. In particular, attention should be paid to ensuring that female juveniles are provided with ready access to sanitary and washing facilities as well as to hygiene items, such as sanitary towels. 106. Juvenile ofenders should also be allowed to wear their own clothing if it is suitable. Those who do not have suitable clothing of their own should be provided with non-uniform clothing by the establishment. c. Regime 107. Although a lack of purposeful activities is detrimental for any prisoner, it is especially harmful for juveniles, who have a particular need for physical activity and intellectual stimulation. Juvenile inmates should be provided throughout the day with a full programme of education, sport, vocational training, recreation and other purposeful out-of-cell activities.