condition mean min max ZT0-3 3.0113795 2.12414 4.761934999999999 ZT4-7 2.773675 2.773675 2.773675 ZT8-11 1.5396550000000002 1.5396550000000002 1.5396550000000002 ZT12-15 1.86157325 1.0149715000000001 2.7081749999999998 ZT16-19 1.530795 1.530795 1.530795 ZT20-23 1.1463855 1.1463855 1.1463855