condition mean min max ZT0-3 25.35 25.35 25.35 ZT4-7 18.5 18.5 18.5 ZT8-11 39.5 39.5 39.5 ZT12-15 42.6 42.6 42.6 ZT16-19 20.5 20.5 20.5 ZT20-23 17.45 17.45 17.45