condition mean min max ZT0-3 2.18573 1.9196049999999998 2.451855 ZT4-7 2.58303 2.58303 2.58303 ZT8-11 1.673555 1.673555 1.673555 ZT12-15 0 0 0 ZT16-19 3.076825 3.076825 3.076825 ZT20-23 5.201225 5.201225 5.201225