condition mean min max ZT0-3 1.6976325 1.54055 1.8547150000000001 ZT4-7 3.00122 3.00122 3.00122 ZT8-11 2.4159249999999997 2.4159249999999997 2.4159249999999997 ZT12-15 0 0 0 ZT16-19 2.607415 2.607415 2.607415 ZT20-23 2.473525 2.473525 2.473525