condition mean min max ZT0-3 11.41301 10.01177 12.81425 ZT4-7 7.863275 7.863275 7.863275 ZT8-11 7.86979 7.86979 7.86979 ZT12-15 0 0 0 ZT16-19 9.260055000000001 9.260055000000001 9.260055000000001 ZT20-23 10.75565 10.75565 10.75565