condition mean min max ZT0-3 17.3 17.3 17.3 ZT4-7 42.3 42.3 42.3 ZT8-11 6.05 6.05 6.05 ZT12-15 38.8 38.8 38.8 ZT16-19 21.0 21.0 21.0 ZT20-23 31.75 31.75 31.75