condition mean min max ZT0-3 74.361745 74.361745 74.361745 ZT4-7 71.6572725 71.6572725 71.6572725 ZT8-11 69.324033 69.324033 69.324033 ZT12-15 75.3984675 75.3984675 75.3984675 ZT16-19 75.175117 75.175117 75.175117 ZT20-23 61.202758 61.202758 61.202758