condition mean min max ZT0-3 68.15919 68.15919 68.15919 ZT4-7 54.309235 54.309235 54.309235 ZT8-11 82.386189 82.386189 82.386189 ZT12-15 143.960671 143.960671 143.960671 ZT16-19 173.3149885 173.3149885 173.3149885 ZT20-23 225.54132750000002 225.54132750000002 225.54132750000002