condition mean min max ZT0-3 73.65 73.65 73.65 ZT4-7 110.0 110.0 110.0 ZT8-11 89.45 89.45 89.45 ZT12-15 61.15 61.15 61.15 ZT16-19 48.5 48.5 48.5 ZT20-23 50.3 50.3 50.3