condition mean min max ZT0-3 0.57606775 0.36826 0.7838755 ZT4-7 3.0021 3.0021 3.0021 ZT8-11 7.23916 7.23916 7.23916 ZT12-15 0 0 0 ZT16-19 3.7417 3.7417 3.7417 ZT20-23 1.7590599999999998 1.7590599999999998 1.7590599999999998