condition mean min max ZT0-3 0.081644 0.0 0.163288 ZT4-7 2.0918259999999997 2.0918259999999997 2.0918259999999997 ZT8-11 1.1566435 1.1566435 1.1566435 ZT12-15 0 0 0 ZT16-19 0.4880225 0.4880225 0.4880225 ZT20-23 0.081404 0.081404 0.081404