condition mean min max ZT0-3 1.8237148333333333 0.8912694999999999 2.31842 ZT4-7 0.884347 0.884347 0.884347 ZT8-11 0.6582905 0.6582905 0.6582905 ZT12-15 1.293703 0.953706 1.6337 ZT16-19 1.70375 1.70375 1.70375 ZT20-23 2.587225 2.587225 2.587225