condition mean min max ZT0-3 0.25417957300000005 0.0 0.5083591460000001 ZT4-7 4.66521285875 3.2041773565000002 6.126248361 ZT8-11 3.69878116175 2.588508816 4.8090535075 ZT12-15 12.653077853500001 7.709305991999999 17.596849715 ZT16-19 32.334453090000004 24.895338565 39.773567615000005 ZT20-23 51.964319970000005 40.386385860000004 63.542254080000006