condition mean min max ZT0-3 16.4 16.4 16.4 ZT4-7 29.4 29.4 29.4 ZT8-11 38.5 38.5 38.5 ZT12-15 34.75 34.75 34.75 ZT16-19 27.65 27.65 27.65 ZT20-23 9.3 9.3 9.3