condition mean min max ZT0-3 41.6493 41.6493 41.6493 ZT4-7 28.2861 28.2861 28.2861 ZT8-11 28.1757 28.1757 28.1757 ZT12-15 29.8863 29.8863 29.8863 ZT16-19 34.7525 34.7525 34.7525 ZT20-23 34.35035 34.35035 34.35035