condition mean min max ZT0-3 2646.6000000000004 2646.6000000000004 2646.6000000000004 ZT4-7 1665.4 1665.4 1665.4 ZT8-11 1869.3000000000002 1869.3000000000002 1869.3000000000002 ZT12-15 1766.0 1766.0 1766.0 ZT16-19 2383.8999999999996 2383.8999999999996 2383.8999999999996 ZT20-23 3074.4 3074.4 3074.4