condition mean min max ZT0-3 20.302750000000003 19.262500000000003 21.343 ZT4-7 20.1795 20.1795 20.1795 ZT8-11 25.34485 25.34485 25.34485 ZT12-15 0 0 0 ZT16-19 28.950400000000002 28.950400000000002 28.950400000000002 ZT20-23 26.277549999999998 26.277549999999998 26.277549999999998