condition mean min max ZT0-3 4.071575 3.596485 4.546665 ZT4-7 3.64316 3.64316 3.64316 ZT8-11 3.664865 3.664865 3.664865 ZT12-15 0 0 0 ZT16-19 5.067155 5.067155 5.067155 ZT20-23 0.8998630000000001 0.8998630000000001 0.8998630000000001