condition mean min max ZT0-3 132.85 132.85 132.85 ZT4-7 294.2 294.2 294.2 ZT8-11 486.65000000000003 486.65000000000003 486.65000000000003 ZT12-15 870.95 870.95 870.95 ZT16-19 765.95 765.95 765.95 ZT20-23 300.0 300.0 300.0