condition mean min max ZT0-3 12.038075 10.91835 13.1578 ZT4-7 16.960549999999998 16.960549999999998 16.960549999999998 ZT8-11 24.83255 24.83255 24.83255 ZT12-15 0 0 0 ZT16-19 22.81175 22.81175 22.81175 ZT20-23 19.3516 19.3516 19.3516