condition mean min max ZT0-3 75.35818 75.35818 75.35818 ZT4-7 56.891739 56.891739 56.891739 ZT8-11 50.8558135 50.8558135 50.8558135 ZT12-15 65.325598 65.325598 65.325598 ZT16-19 29.23872 29.23872 29.23872 ZT20-23 33.0762175 33.0762175 33.0762175