condition mean min max ZT0-3 27.307525142499998 17.986218495 36.62883179 ZT4-7 19.201999765 17.581493029999997 20.822506500000003 ZT8-11 29.0763610775 23.091819305 35.06090285 ZT12-15 30.275814457499997 27.595234384999998 32.95639453 ZT16-19 20.026734035 19.980253065 20.073215005 ZT20-23 15.07705947 14.542695495 15.611423445