condition mean min max ZT0-3 16.9423 15.698599999999999 18.186 ZT4-7 14.029 14.029 14.029 ZT8-11 13.122150000000001 13.122150000000001 13.122150000000001 ZT12-15 0 0 0 ZT16-19 25.4036 25.4036 25.4036 ZT20-23 20.9374 20.9374 20.9374