condition mean min max ZT0-3 2356.3199999999997 2356.3199999999997 2356.3199999999997 ZT4-7 2486.5150000000003 2486.5150000000003 2486.5150000000003 ZT8-11 2213.025 2213.025 2213.025 ZT12-15 1908.505 1908.505 1908.505 ZT16-19 1573.99 1573.99 1573.99 ZT20-23 2227.265 2227.265 2227.265