condition mean min max ZT0-3 5.773618333333333 4.23461 8.2019 ZT4-7 3.97583 3.97583 3.97583 ZT8-11 1.903175 1.903175 1.903175 ZT12-15 4.37574 4.264670000000001 4.48681 ZT16-19 3.24042 3.24042 3.24042 ZT20-23 1.498005 1.498005 1.498005