condition mean min max ZT0-3 46.12535 43.3106 48.9401 ZT4-7 40.07325 40.07325 40.07325 ZT8-11 49.809250000000006 49.809250000000006 49.809250000000006 ZT12-15 0 0 0 ZT16-19 55.455 55.455 55.455 ZT20-23 54.5594 54.5594 54.5594