condition mean min max ZT0-3 26.343899999999998 16.0889 33.90295 ZT4-7 15.24645 15.24645 15.24645 ZT8-11 18.54955 18.54955 18.54955 ZT12-15 20.66695 15.583400000000001 25.7505 ZT16-19 31.73975 31.73975 31.73975 ZT20-23 42.1733 42.1733 42.1733