condition mean min max ZT0-3 4.7285157152499995 4.2717153255 5.185316105 ZT4-7 2.678396264 2.440054986 2.916737542 ZT8-11 4.674788887 3.9364376915 5.4131400825 ZT12-15 4.4010339165 4.3281493695 4.4739184635 ZT16-19 3.2000247017500003 2.8534198765000003 3.5466295270000003 ZT20-23 4.62646581025 4.333781238 4.9191503825