condition mean min max ZT0-3 17.4 17.4 17.4 ZT4-7 1.4 1.4 1.4 ZT8-11 23.55 23.55 23.55 ZT12-15 32.35 32.35 32.35 ZT16-19 47.55 47.55 47.55 ZT20-23 24.1 24.1 24.1