condition mean min max ZT0-3 1.3373857337500001 0.8560335434999999 1.8187379240000001 ZT4-7 1.2534809727499998 0.9140876954999999 1.59287425 ZT8-11 3.15962052475 2.453760675 3.8654803745 ZT12-15 4.6120723095 4.416873933 4.807270686 ZT16-19 3.15230332825 2.9234463935 3.381160263 ZT20-23 5.95512534925 4.5724385685 7.33781213