condition mean min max ZT0-3 10.637765 10.637765 10.637765 ZT4-7 27.943600000000004 27.943600000000004 27.943600000000004 ZT8-11 19.2199 19.2199 19.2199 ZT12-15 8.118780000000001 8.118780000000001 8.118780000000001 ZT16-19 3.796565 3.796565 3.796565 ZT20-23 4.238605 4.238605 4.238605