condition mean min max ZT0-3 13.801375 11.94385 15.658900000000001 ZT4-7 28.48895 28.48895 28.48895 ZT8-11 37.278800000000004 37.278800000000004 37.278800000000004 ZT12-15 0 0 0 ZT16-19 33.97285 33.97285 33.97285 ZT20-23 21.90985 21.90985 21.90985