condition mean min max ZT0-3 9.880391 9.880391 9.880391 ZT4-7 14.8305585 14.8305585 14.8305585 ZT8-11 10.521389 10.521389 10.521389 ZT12-15 10.262652 10.262652 10.262652 ZT16-19 9.464866 9.464866 9.464866 ZT20-23 9.3178895 9.3178895 9.3178895