condition mean min max ZT0-3 14.7 14.7 14.7 ZT4-7 24.6 24.6 24.6 ZT8-11 14.7 14.7 14.7 ZT12-15 9.35 9.35 9.35 ZT16-19 4.1 4.1 4.1 ZT20-23 4.5 4.5 4.5