condition mean min max ZT0-3 14.2796 14.2796 14.2796 ZT4-7 13.285 13.285 13.285 ZT8-11 15.42285 15.42285 15.42285 ZT12-15 15.234950000000001 15.234950000000001 15.234950000000001 ZT16-19 17.224800000000002 17.224800000000002 17.224800000000002 ZT20-23 14.66795 14.66795 14.66795