condition mean min max ZT0-3 163.19833333333332 154.7195 171.8645 ZT4-7 151.41199999999998 151.41199999999998 151.41199999999998 ZT8-11 143.777 143.777 143.777 ZT12-15 141.3625 130.1835 152.54149999999998 ZT16-19 124.6735 124.6735 124.6735 ZT20-23 170.518 170.518 170.518