condition mean min max ZT0-3 2114.75 2114.75 2114.75 ZT4-7 3008.8 3008.8 3008.8 ZT8-11 3256.65 3256.65 3256.65 ZT12-15 3334.1499999999996 3334.1499999999996 3334.1499999999996 ZT16-19 2866.8500000000004 2866.8500000000004 2866.8500000000004 ZT20-23 2162.65 2162.65 2162.65