condition mean min max ZT0-3 867.3 867.3 867.3 ZT4-7 994.0 994.0 994.0 ZT8-11 891.6 891.6 891.6 ZT12-15 891.8 891.8 891.8 ZT16-19 845.55 845.55 845.55 ZT20-23 875.15 875.15 875.15