condition mean min max ZT0-3 13.863599 13.863599 13.863599 ZT4-7 11.640421 11.640421 11.640421 ZT8-11 11.509937 11.509937 11.509937 ZT12-15 10.439979000000001 10.439979000000001 10.439979000000001 ZT16-19 10.2069035 10.2069035 10.2069035 ZT20-23 10.983452499999999 10.983452499999999 10.983452499999999