condition mean min max ZT0-3 26.026575 25.80055 26.2526 ZT4-7 35.81335 35.81335 35.81335 ZT8-11 51.348600000000005 51.348600000000005 51.348600000000005 ZT12-15 0 0 0 ZT16-19 45.745850000000004 45.745850000000004 45.745850000000004 ZT20-23 36.0116 36.0116 36.0116