condition mean min max ZT0-3 32.1 32.1 32.1 ZT4-7 29.3 29.3 29.3 ZT8-11 29.65 29.65 29.65 ZT12-15 39.35 39.35 39.35 ZT16-19 32.25 32.25 32.25 ZT20-23 41.95 41.95 41.95