condition mean min max ZT0-3 60.614324999999994 54.5392 66.68945 ZT4-7 50.16905 50.16905 50.16905 ZT8-11 51.600899999999996 51.600899999999996 51.600899999999996 ZT12-15 0 0 0 ZT16-19 63.10980000000001 63.10980000000001 63.10980000000001 ZT20-23 60.4396 60.4396 60.4396