condition mean min max ZT0-3 16.21065 16.21065 16.21065 ZT4-7 11.3392 11.3392 11.3392 ZT8-11 13.524550000000001 13.524550000000001 13.524550000000001 ZT12-15 13.80555 13.80555 13.80555 ZT16-19 17.644849999999998 17.644849999999998 17.644849999999998 ZT20-23 16.96545 16.96545 16.96545