condition mean min max ZT0-3 1.01150625 0.9335315 1.089481 ZT4-7 0.8720865 0.8720865 0.8720865 ZT8-11 4.88623 4.88623 4.88623 ZT12-15 0 0 0 ZT16-19 3.8261950000000002 3.8261950000000002 3.8261950000000002 ZT20-23 2.64081 2.64081 2.64081