condition mean min max ZT0-3 4.3266825 3.92871 4.724655 ZT4-7 4.001555 4.001555 4.001555 ZT8-11 1.329985 1.329985 1.329985 ZT12-15 0 0 0 ZT16-19 3.219775 3.219775 3.219775 ZT20-23 6.55722 6.55722 6.55722