condition mean min max ZT0-3 6.466989999999999 5.7479499999999994 7.18603 ZT4-7 3.003725 3.003725 3.003725 ZT8-11 1.64201 1.64201 1.64201 ZT12-15 0 0 0 ZT16-19 3.62378 3.62378 3.62378 ZT20-23 3.7330550000000002 3.7330550000000002 3.7330550000000002