condition mean min max ZT0-3 0.1709592975 0.14830168800000001 0.193616907 ZT4-7 2.6031709665 1.1349132605 4.0714286725 ZT8-11 6.61679002525 5.846813635 7.3867664155 ZT12-15 4.07419913375 3.1853545530000003 4.9630437144999995 ZT16-19 5.093632862250001 4.5204973265 5.666768398 ZT20-23 9.73107472575 8.1947866965 11.267362755