condition mean min max ZT0-3 37.4645638225 20.455171165 54.47395648 ZT4-7 17.791964035 17.77201246 17.81191561 ZT8-11 23.911053165 20.863270015 26.958836315 ZT12-15 33.3728231675 30.80766911 35.937977225 ZT16-19 50.7683279725 50.051705165 51.48495078 ZT20-23 56.027701255 50.893086139999994 61.16231637