condition mean min max ZT0-3 0.6852365 0.5324075 0.8380654999999999 ZT4-7 0.6637775 0.6637775 0.6637775 ZT8-11 1.36756 1.36756 1.36756 ZT12-15 0 0 0 ZT16-19 1.73749 1.73749 1.73749 ZT20-23 0.9889695000000001 0.9889695000000001 0.9889695000000001