condition mean min max ZT0-3 4.510628333333333 4.325996666666667 4.695259999999999 ZT4-7 4.66076 4.66076 4.66076 ZT8-11 6.45324 6.45324 6.45324 ZT12-15 9.199165 7.50087 10.89746 ZT16-19 4.5088550000000005 3.83127 5.18644 ZT20-23 0 0 0