condition mean min max ZT0-3 9.484715000000001 9.344885 9.624545000000001 ZT4-7 6.223735 6.223735 6.223735 ZT8-11 5.961685 5.961685 5.961685 ZT12-15 0 0 0 ZT16-19 7.897349999999999 7.897349999999999 7.897349999999999 ZT20-23 9.244589999999999 9.244589999999999 9.244589999999999