condition mean min max ZT0-3 150.133575 150.133575 150.133575 ZT4-7 87.3325035 87.3325035 87.3325035 ZT8-11 74.2894355 74.2894355 74.2894355 ZT12-15 82.6722405 82.6722405 82.6722405 ZT16-19 45.81867 45.81867 45.81867 ZT20-23 57.191963 57.191963 57.191963