condition mean min max ZT0-3 87.078362 87.078362 87.078362 ZT4-7 82.934378 82.934378 82.934378 ZT8-11 38.058839 38.058839 38.058839 ZT12-15 45.502084 45.502084 45.502084 ZT16-19 135.9661255 135.9661255 135.9661255 ZT20-23 214.871664 214.871664 214.871664