condition mean min max ZT0-3 46.351275 43.63295 49.069599999999994 ZT4-7 59.05030000000001 59.05030000000001 59.05030000000001 ZT8-11 43.52275 43.52275 43.52275 ZT12-15 0 0 0 ZT16-19 63.09475 63.09475 63.09475 ZT20-23 56.2011 56.2011 56.2011