condition mean min max ZT0-3 0.0382063 0.0382063 0.0382063 ZT4-7 0.03799475 0.03799475 0.03799475 ZT8-11 0.0481317 0.0481317 0.0481317 ZT12-15 0.058461299999999994 0.058461299999999994 0.058461299999999994 ZT16-19 0.0660507 0.0660507 0.0660507 ZT20-23 0.02201345 0.02201345 0.02201345