condition mean min max ZT0-3 13.23215 13.23215 13.23215 ZT4-7 11.461549999999999 11.461549999999999 11.461549999999999 ZT8-11 5.28779 5.28779 5.28779 ZT12-15 4.942880000000001 4.942880000000001 4.942880000000001 ZT16-19 7.41108 7.41108 7.41108 ZT20-23 11.6913 11.6913 11.6913