condition mean min max ZT0-3 9.4328325 5.535114999999999 13.33055 ZT4-7 1.5680705 1.5680705 1.5680705 ZT8-11 1.8744 1.8744 1.8744 ZT12-15 0 0 0 ZT16-19 2.74313 2.74313 2.74313 ZT20-23 3.061375 3.061375 3.061375