condition mean min max ZT0-3 91.4 91.4 91.4 ZT4-7 50.9 50.9 50.9 ZT8-11 11.8 11.8 11.8 ZT12-15 38.9 38.9 38.9 ZT16-19 22.7 22.7 22.7 ZT20-23 47.8 47.8 47.8