condition mean min max ZT0-3 43.5 43.5 43.5 ZT4-7 48.7 48.7 48.7 ZT8-11 52.1 52.1 52.1 ZT12-15 54.95 54.95 54.95 ZT16-19 63.2 63.2 63.2 ZT20-23 61.05 61.05 61.05