condition mean min max ZT0-3 44.65 44.65 44.65 ZT4-7 20.6 20.6 20.6 ZT8-11 19.85 19.85 19.85 ZT12-15 8.3 8.3 8.3 ZT16-19 21.3 21.3 21.3 ZT20-23 19.45 19.45 19.45