condition mean min max ZT0-3 2.1598075000000003 2.06894 2.250675 ZT4-7 0.9132739999999999 0.9132739999999999 0.9132739999999999 ZT8-11 1.34566 1.34566 1.34566 ZT12-15 0 0 0 ZT16-19 2.054885 2.054885 2.054885 ZT20-23 2.11853 2.11853 2.11853