condition mean min max ZT0-3 34.561775 33.0727 36.05085 ZT4-7 26.646349999999998 26.646349999999998 26.646349999999998 ZT8-11 38.78955 38.78955 38.78955 ZT12-15 0 0 0 ZT16-19 55.758399999999995 55.758399999999995 55.758399999999995 ZT20-23 40.83995 40.83995 40.83995