condition mean min max ZT0-3 9.011845763 8.200034771 9.823656755 ZT4-7 14.110631185 13.026210925 15.195051445 ZT8-11 23.7977446075 14.491239865 33.10424935 ZT12-15 44.279086275000004 40.267248585000004 48.290923965000005 ZT16-19 24.4310744075 19.041520325 29.820628489999997 ZT20-23 9.42219937225 6.4990054095000005 12.345393335