condition mean min max ZT0-3 30.078007 30.078007 30.078007 ZT4-7 24.465975999999998 24.465975999999998 24.465975999999998 ZT8-11 22.149086500000003 22.149086500000003 22.149086500000003 ZT12-15 24.586348 24.586348 24.586348 ZT16-19 35.0614525 35.0614525 35.0614525 ZT20-23 30.153246 30.153246 30.153246