condition mean min max ZT0-3 23.15 23.15 23.15 ZT4-7 23.2 23.2 23.2 ZT8-11 20.85 20.85 20.85 ZT12-15 17.4 17.4 17.4 ZT16-19 15.0 15.0 15.0 ZT20-23 7.35 7.35 7.35