condition mean min max ZT0-3 206.087765 206.087765 206.087765 ZT4-7 118.5890135 118.5890135 118.5890135 ZT8-11 57.0986695 57.0986695 57.0986695 ZT12-15 68.7108015 68.7108015 68.7108015 ZT16-19 61.1150555 61.1150555 61.1150555 ZT20-23 55.1223795 55.1223795 55.1223795