condition mean min max ZT0-3 63.584195381 36.003298302 91.16509246 ZT4-7 14.43579025275 12.4042439005 16.467336605 ZT8-11 26.060602949999996 20.892160715 31.229045184999997 ZT12-15 26.1140062575 22.458443595 29.76956892 ZT16-19 20.788240057499998 19.87774207 21.698738045 ZT20-23 24.9250632705 24.331880169999998 25.518246371000004