condition mean min max ZT0-3 60.5044009475 58.84188864 62.166913255 ZT4-7 34.329495385 33.021235905 35.637754865 ZT8-11 51.465955055 36.66619337 66.26571674 ZT12-15 45.551015845 34.34546711 56.75656458 ZT16-19 20.177519412499997 17.85611667 22.498922155 ZT20-23 14.278424707500001 12.98275652 15.574092895