condition mean min max ZT0-3 7.395077499999999 7.18297 7.607184999999999 ZT4-7 6.519985 6.519985 6.519985 ZT8-11 9.200624999999999 9.200624999999999 9.200624999999999 ZT12-15 0 0 0 ZT16-19 8.457445 8.457445 8.457445 ZT20-23 8.656035 8.656035 8.656035