condition mean min max ZT0-3 0.1753595 0.14201999999999998 0.2056635 ZT4-7 0.1346499 0.1346499 0.1346499 ZT8-11 0.20672000000000001 0.20672000000000001 0.20672000000000001 ZT12-15 0.23102725 0.21517199999999997 0.2468825 ZT16-19 0.423706 0.423706 0.423706 ZT20-23 0.3289755 0.3289755 0.3289755