condition mean min max ZT0-3 0.80851575 0.5102015 1.10683 ZT4-7 0.616658 0.616658 0.616658 ZT8-11 0.412271 0.412271 0.412271 ZT12-15 0 0 0 ZT16-19 0.2010815 0.2010815 0.2010815 ZT20-23 0.908906 0.908906 0.908906