condition mean min max ZT0-3 54.220600000000005 49.708650000000006 58.73255 ZT4-7 31.008200000000002 31.008200000000002 31.008200000000002 ZT8-11 22.499699999999997 22.499699999999997 22.499699999999997 ZT12-15 0 0 0 ZT16-19 42.324299999999994 42.324299999999994 42.324299999999994 ZT20-23 43.70795 43.70795 43.70795