condition mean min max ZT0-3 2.00728 1.87591 2.13865 ZT4-7 1.766305 1.766305 1.766305 ZT8-11 2.337145 2.337145 2.337145 ZT12-15 0 0 0 ZT16-19 3.15457 3.15457 3.15457 ZT20-23 3.210275 3.210275 3.210275