condition mean min max ZT0-3 52.8 52.8 52.8 ZT4-7 59.9 59.9 59.9 ZT8-11 89.5 89.5 89.5 ZT12-15 98.1 98.1 98.1 ZT16-19 50.6 50.6 50.6 ZT20-23 50.4 50.4 50.4