condition mean min max ZT0-3 13.51295 12.43215 14.59375 ZT4-7 9.464525 9.464525 9.464525 ZT8-11 22.3166 22.3166 22.3166 ZT12-15 0 0 0 ZT16-19 18.5872 18.5872 18.5872 ZT20-23 14.53485 14.53485 14.53485