condition mean min max ZT0-3 6.4455350000000005 5.699725000000001 7.191345 ZT4-7 3.507765 3.507765 3.507765 ZT8-11 9.02645 9.02645 9.02645 ZT12-15 0 0 0 ZT16-19 30.9315 30.9315 30.9315 ZT20-23 26.695999999999998 26.695999999999998 26.695999999999998