condition mean min max ZT0-3 9.45 9.45 9.45 ZT4-7 21.6 21.6 21.6 ZT8-11 13.4 13.4 13.4 ZT12-15 12.7 12.7 12.7 ZT16-19 8.25 8.25 8.25 ZT20-23 7.35 7.35 7.35