condition mean min max ZT0-3 2.9432975 2.194595 3.692 ZT4-7 5.12903 5.12903 5.12903 ZT8-11 9.27287 9.27287 9.27287 ZT12-15 0 0 0 ZT16-19 4.713325 4.713325 4.713325 ZT20-23 0.726715 0.726715 0.726715