condition mean min max ZT0-3 107.94371 107.94371 107.94371 ZT4-7 111.819688 111.819688 111.819688 ZT8-11 133.09960949999999 133.09960949999999 133.09960949999999 ZT12-15 115.5226675 115.5226675 115.5226675 ZT16-19 127.73020700000001 127.73020700000001 127.73020700000001 ZT20-23 83.74602300000001 83.74602300000001 83.74602300000001