condition mean min max ZT0-3 49.148606 49.148606 49.148606 ZT4-7 34.9851365 34.9851365 34.9851365 ZT8-11 27.352064 27.352064 27.352064 ZT12-15 29.434789 29.434789 29.434789 ZT16-19 21.926471499999998 21.926471499999998 21.926471499999998 ZT20-23 27.107347 27.107347 27.107347