condition mean min max ZT0-3 0.13043351666666667 0.03958505 0.194883 ZT4-7 0.2421125 0.2421125 0.2421125 ZT8-11 7.451055 7.451055 7.451055 ZT12-15 3.26467 2.3047500000000003 4.22459 ZT16-19 1.3364500000000001 1.3364500000000001 1.3364500000000001 ZT20-23 0.49327150000000003 0.49327150000000003 0.49327150000000003