condition mean min max ZT0-3 14.498375 12.775749999999999 16.221 ZT4-7 9.513685 9.513685 9.513685 ZT8-11 11.686399999999999 11.686399999999999 11.686399999999999 ZT12-15 0 0 0 ZT16-19 12.52385 12.52385 12.52385 ZT20-23 12.524000000000001 12.524000000000001 12.524000000000001