condition mean min max ZT0-3 70.853027 70.853027 70.853027 ZT4-7 84.9470555 84.9470555 84.9470555 ZT8-11 45.173767 45.173767 45.173767 ZT12-15 73.79873799999999 73.79873799999999 73.79873799999999 ZT16-19 30.508837 30.508837 30.508837 ZT20-23 19.123803 19.123803 19.123803