condition mean min max ZT0-3 24.7 24.7 24.7 ZT4-7 10.9 10.9 10.9 ZT8-11 31.9 31.9 31.9 ZT12-15 11.8 11.8 11.8 ZT16-19 13.85 13.85 13.85 ZT20-23 27.65 27.65 27.65