condition mean min max ZT0-3 1.55 1.55 1.55 ZT4-7 6.0 6.0 6.0 ZT8-11 23.0 23.0 23.0 ZT12-15 9.55 9.55 9.55 ZT16-19 14.3 14.3 14.3 ZT20-23 6.35 6.35 6.35