condition mean min max ZT0-3 6.56025 5.837104999999999 7.2833950000000005 ZT4-7 3.919295 3.919295 3.919295 ZT8-11 1.917935 1.917935 1.917935 ZT12-15 0 0 0 ZT16-19 4.21894 4.21894 4.21894 ZT20-23 5.655810000000001 5.655810000000001 5.655810000000001