condition mean min max ZT0-3 21.65345 21.65345 21.65345 ZT4-7 17.107599999999998 17.107599999999998 17.107599999999998 ZT8-11 17.9375 17.9375 17.9375 ZT12-15 19.02955 19.02955 19.02955 ZT16-19 24.7287 24.7287 24.7287 ZT20-23 23.46895 23.46895 23.46895