condition mean min max ZT0-3 34.35 34.35 34.35 ZT4-7 24.6 24.6 24.6 ZT8-11 36.75 36.75 36.75 ZT12-15 39.95 39.95 39.95 ZT16-19 32.45 32.45 32.45 ZT20-23 22.15 22.15 22.15