condition mean min max ZT0-3 21.8 21.8 21.8 ZT4-7 4.1 4.1 4.1 ZT8-11 32.15 32.15 32.15 ZT12-15 40.5 40.5 40.5 ZT16-19 39.7 39.7 39.7 ZT20-23 34.75 34.75 34.75