condition mean min max ZT0-3 51.2 51.2 51.2 ZT4-7 70.4 70.4 70.4 ZT8-11 56.3 56.3 56.3 ZT12-15 31.95 31.95 31.95 ZT16-19 35.3 35.3 35.3 ZT20-23 65.8 65.8 65.8