condition mean min max ZT0-3 72.2 72.2 72.2 ZT4-7 31.4 31.4 31.4 ZT8-11 36.95 36.95 36.95 ZT12-15 69.1 69.1 69.1 ZT16-19 103.6 103.6 103.6 ZT20-23 97.7 97.7 97.7