condition mean min max ZT0-3 1.67947322325 0.9517980325 2.407148414 ZT4-7 4.751518797499999 2.778604442 6.724433153 ZT8-11 84.16511456999999 76.32743590999999 92.00279323 ZT12-15 19.183652357333333 3.6251058653333335 34.742198849333334 ZT16-19 3.7844853401666665 2.7229970863333333 4.845973594 ZT20-23 2.1373403145000003 1.786839652 2.4878409770000003