condition mean min max ZT0-3 1.0 1.0 1.0 ZT4-7 0.7 0.7 0.7 ZT8-11 14.1 14.1 14.1 ZT12-15 11.149999999999999 11.149999999999999 11.149999999999999 ZT16-19 11.95 11.95 11.95 ZT20-23 6.449999999999999 6.449999999999999 6.449999999999999