condition mean min max ZT0-3 26.48895 18.37265 30.695700000000002 ZT4-7 18.6021 18.6021 18.6021 ZT8-11 17.6992 17.6992 17.6992 ZT12-15 22.511025 22.35205 22.67 ZT16-19 21.536 21.536 21.536 ZT20-23 30.13395 30.13395 30.13395