condition mean min max ZT0-3 87.078362 87.078362 87.078362 ZT4-7 74.9494865 74.9494865 74.9494865 ZT8-11 72.500547 72.500547 72.500547 ZT12-15 67.1041245 67.1041245 67.1041245 ZT16-19 56.597695 56.597695 56.597695 ZT20-23 36.862142 36.862142 36.862142