condition mean min max ZT0-3 9.2549525 9.238315 9.27159 ZT4-7 4.76952 4.76952 4.76952 ZT8-11 5.856585 5.856585 5.856585 ZT12-15 0 0 0 ZT16-19 8.578555 8.578555 8.578555 ZT20-23 7.680385 7.680385 7.680385