condition mean min max ZT0-3 1.894753824 1.337623072 2.451884576 ZT4-7 7.86096146175 4.169730939 11.5521919845 ZT8-11 61.71483262499999 37.880606195 85.54905905499999 ZT12-15 73.07269178 56.49869231500001 89.646691245 ZT16-19 22.046106529 14.859140438 29.233072619999998 ZT20-23 6.376694859750001 4.360770406 8.392619313500001