condition mean min max ZT0-3 26.359125 22.50925 30.209 ZT4-7 13.204145 13.204145 13.204145 ZT8-11 5.60468 5.60468 5.60468 ZT12-15 0 0 0 ZT16-19 4.86054 4.86054 4.86054 ZT20-23 20.742150000000002 20.742150000000002 20.742150000000002