condition mean min max ZT0-3 8.7599975 8.041125 9.47887 ZT4-7 8.859925 8.859925 8.859925 ZT8-11 12.7408 12.7408 12.7408 ZT12-15 0 0 0 ZT16-19 10.9511 10.9511 10.9511 ZT20-23 10.572610000000001 10.572610000000001 10.572610000000001