condition mean min max ZT0-3 0.42468237100000006 0.0 0.8493647420000001 ZT4-7 1.25313844825 0.8392228829999999 1.6670540135 ZT8-11 1.882251845 1.5715996460000001 2.192904044 ZT12-15 1.7808365844999998 1.5154869305 2.0461862385 ZT16-19 3.214019199 3.0253805285 3.4026578695000005 ZT20-23 5.98907317425 5.8863556445 6.091790703999999