condition mean min max ZT0-3 62.190250000000006 56.819050000000004 67.56145000000001 ZT4-7 41.66285 41.66285 41.66285 ZT8-11 30.81555 30.81555 30.81555 ZT12-15 0 0 0 ZT16-19 46.6929 46.6929 46.6929 ZT20-23 57.857699999999994 57.857699999999994 57.857699999999994