condition mean min max ZT0-3 2.05136 2.05136 2.05136 ZT4-7 1.213215 1.213215 1.213215 ZT8-11 1.146645 1.146645 1.146645 ZT12-15 1.71872 1.71872 1.71872 ZT16-19 4.065755 4.065755 4.065755 ZT20-23 2.85613 2.85613 2.85613