condition mean min max ZT0-3 5.8921475 4.44657 7.337724999999999 ZT4-7 5.354835 5.354835 5.354835 ZT8-11 3.86074 3.86074 3.86074 ZT12-15 0 0 0 ZT16-19 4.955045 4.955045 4.955045 ZT20-23 5.2834 5.2834 5.2834