condition mean min max ZT0-3 1.0957621666666666 0.729762 1.4901149999999999 ZT4-7 0.8564084999999999 0.8564084999999999 0.8564084999999999 ZT8-11 1.304345 1.304345 1.304345 ZT12-15 1.2075875 1.1797650000000002 1.23541 ZT16-19 1.2474565 1.2474565 1.2474565 ZT20-23 2.42869 2.42869 2.42869