condition mean min max ZT0-3 399.239007 399.239007 399.239007 ZT4-7 144.92116249999998 144.92116249999998 144.92116249999998 ZT8-11 157.82986599999998 157.82986599999998 157.82986599999998 ZT12-15 236.4063005 236.4063005 236.4063005 ZT16-19 557.9365065 557.9365065 557.9365065 ZT20-23 515.9689605 515.9689605 515.9689605