condition mean min max ZT0-3 1.14612675 0.8674535 1.4248 ZT4-7 3.4069700000000003 3.4069700000000003 3.4069700000000003 ZT8-11 1.6952600000000002 1.6952600000000002 1.6952600000000002 ZT12-15 0 0 0 ZT16-19 0.897445 0.897445 0.897445 ZT20-23 1.846235 1.846235 1.846235