condition mean min max ZT0-3 15.6018 15.6018 15.6018 ZT4-7 14.167349999999999 14.167349999999999 14.167349999999999 ZT8-11 13.17075 13.17075 13.17075 ZT12-15 11.6739 11.6739 11.6739 ZT16-19 16.29525 16.29525 16.29525 ZT20-23 18.3292 18.3292 18.3292