condition mean min max ZT0-3 46.1 46.1 46.1 ZT4-7 64.5 64.5 64.5 ZT8-11 32.55 32.55 32.55 ZT12-15 67.95 67.95 67.95 ZT16-19 60.3 60.3 60.3 ZT20-23 72.15 72.15 72.15