condition mean min max ZT0-3 1.88121 1.88121 1.88121 ZT4-7 2.10128 2.10128 2.10128 ZT8-11 2.050405 2.050405 2.050405 ZT12-15 0.824682 0.824682 0.824682 ZT16-19 2.11602 2.11602 2.11602 ZT20-23 1.51975 1.51975 1.51975