condition mean min max ZT0-3 16.468625 14.087399999999999 18.84985 ZT4-7 7.284565 7.284565 7.284565 ZT8-11 8.184429999999999 8.184429999999999 8.184429999999999 ZT12-15 0 0 0 ZT16-19 15.44275 15.44275 15.44275 ZT20-23 16.1955 16.1955 16.1955