condition mean min max ZT0-3 1.32732 1.2237900000000002 1.51983 ZT4-7 4.41203 4.41203 4.41203 ZT8-11 3.16664 3.16664 3.16664 ZT12-15 3.3505025 2.324885 4.37612 ZT16-19 3.0964150000000004 3.0964150000000004 3.0964150000000004 ZT20-23 2.682125 2.682125 2.682125