condition mean min max ZT0-3 8.521685000000002 7.6415500000000005 9.40182 ZT4-7 5.74161 5.74161 5.74161 ZT8-11 6.938129999999999 6.938129999999999 6.938129999999999 ZT12-15 0 0 0 ZT16-19 8.682875 8.682875 8.682875 ZT20-23 6.676550000000001 6.676550000000001 6.676550000000001