condition mean min max ZT0-3 36.7107 36.7107 36.7107 ZT4-7 25.1289 25.1289 25.1289 ZT8-11 13.5105 13.5105 13.5105 ZT12-15 11.67795 11.67795 11.67795 ZT16-19 41.21965 41.21965 41.21965 ZT20-23 37.4393 37.4393 37.4393