condition mean min max ZT0-3 1.2236748333333334 0.2841955 3.07444 ZT4-7 0.4207835 0.4207835 0.4207835 ZT8-11 0.191918 0.191918 0.191918 ZT12-15 1.42092 1.28876 1.55308 ZT16-19 0.795507 0.795507 0.795507 ZT20-23 0.33652 0.33652 0.33652