condition mean min max ZT0-3 8.35 8.35 8.35 ZT4-7 18.8 18.8 18.8 ZT8-11 7.25 7.25 7.25 ZT12-15 6.0 6.0 6.0 ZT16-19 14.4 14.4 14.4 ZT20-23 6.449999999999999 6.449999999999999 6.449999999999999