condition mean min max ZT0-3 0.42902412050000005 0.4092405 0.44880774100000004 ZT4-7 0.9119350557499999 0.586513835 1.2373562765 ZT8-11 3.1793357660000003 2.5238156205 3.8348559115 ZT12-15 4.96531794875 4.176463565000001 5.7541723325 ZT16-19 1.296753168 1.0149725070000002 1.578533829 ZT20-23 0.83108332575 0.7911384610000001 0.8710281904999999