condition mean min max ZT0-3 6.223735 6.223735 6.223735 ZT4-7 1.611405 1.611405 1.611405 ZT8-11 7.41373 7.41373 7.41373 ZT12-15 1.5945 1.5945 1.5945 ZT16-19 13.9367 13.9367 13.9367 ZT20-23 0.698405 0.698405 0.698405