condition mean min max ZT0-3 9.0073075 8.658 9.356615000000001 ZT4-7 6.89618 6.89618 6.89618 ZT8-11 5.823855 5.823855 5.823855 ZT12-15 0 0 0 ZT16-19 7.8356650000000005 7.8356650000000005 7.8356650000000005 ZT20-23 8.993695 8.993695 8.993695