condition mean min max ZT0-3 22.391025 19.66565 25.1164 ZT4-7 33.57275 33.57275 33.57275 ZT8-11 13.81055 13.81055 13.81055 ZT12-15 0 0 0 ZT16-19 38.208299999999994 38.208299999999994 38.208299999999994 ZT20-23 54.486149999999995 54.486149999999995 54.486149999999995