condition mean min max ZT0-3 0.0183206 0.0 0.0366412 ZT4-7 0.0 0.0 0.0 ZT8-11 0.03710785 0.03710785 0.03710785 ZT12-15 0 0 0 ZT16-19 0.03698265 0.03698265 0.03698265 ZT20-23 0.0741917 0.0741917 0.0741917