condition mean min max ZT0-3 5.3815875 3.1748650000000005 7.58831 ZT4-7 2.42239 2.42239 2.42239 ZT8-11 4.79471 4.79471 4.79471 ZT12-15 0 0 0 ZT16-19 3.7278200000000004 3.7278200000000004 3.7278200000000004 ZT20-23 2.371565 2.371565 2.371565