condition mean min max ZT0-3 60.6 60.6 60.6 ZT4-7 57.7 57.7 57.7 ZT8-11 39.5 39.5 39.5 ZT12-15 61.05 61.05 61.05 ZT16-19 19.9 19.9 19.9 ZT20-23 29.65 29.65 29.65