condition mean min max ZT0-3 1989.65 1989.65 1989.65 ZT4-7 1066.5 1066.5 1066.5 ZT8-11 1608.75 1608.75 1608.75 ZT12-15 1360.0500000000002 1360.0500000000002 1360.0500000000002 ZT16-19 1570.85 1570.85 1570.85 ZT20-23 2229.15 2229.15 2229.15