condition mean min max ZT0-3 2.5214 2.0488150000000003 2.993985 ZT4-7 3.096755 3.096755 3.096755 ZT8-11 3.67542 3.67542 3.67542 ZT12-15 0 0 0 ZT16-19 4.651965 4.651965 4.651965 ZT20-23 2.861115 2.861115 2.861115