condition mean min max ZT0-3 12.0525475 11.30405 12.801045 ZT4-7 18.21345 18.21345 18.21345 ZT8-11 39.35495 39.35495 39.35495 ZT12-15 0 0 0 ZT16-19 33.1065 33.1065 33.1065 ZT20-23 24.07365 24.07365 24.07365