condition mean min max ZT0-3 40.337320115 38.36169208 42.31294815 ZT4-7 72.66570458 61.41835855 83.91305061 ZT8-11 138.2716303 113.7413865 162.8018741 ZT12-15 81.97757706249999 45.103812975 118.85134115 ZT16-19 29.9629370075 24.366174195 35.55969982 ZT20-23 14.2316919725 12.0427273 16.420656645