condition mean min max ZT0-3 23.1 23.1 23.1 ZT4-7 17.5 17.5 17.5 ZT8-11 50.7 50.7 50.7 ZT12-15 46.65 46.65 46.65 ZT16-19 36.25 36.25 36.25 ZT20-23 59.9 59.9 59.9