condition mean min max ZT0-3 4.4408 1.432375 6.43513 ZT4-7 0.8911985 0.8911985 0.8911985 ZT8-11 0.459548 0.459548 0.459548 ZT12-15 0.7313149999999999 0.600374 0.8622559999999999 ZT16-19 1.365175 1.365175 1.365175 ZT20-23 1.903365 1.903365 1.903365