condition mean min max ZT0-3 200.98849 200.98849 200.98849 ZT4-7 347.477664 347.477664 347.477664 ZT8-11 300.167696 300.167696 300.167696 ZT12-15 396.9120725 396.9120725 396.9120725 ZT16-19 278.276887 278.276887 278.276887 ZT20-23 151.1508 151.1508 151.1508