condition mean min max ZT0-3 35.659226195 32.22366605 39.09478634 ZT4-7 42.161671305 35.30441535 49.01892726 ZT8-11 37.503187374999996 36.539255365 38.467119385 ZT12-15 14.9957828935 11.31602916 18.675536627 ZT16-19 9.3436449845 9.204502298 9.482787671 ZT20-23 9.85199221825 8.4693493015 11.234635135