condition mean min max ZT0-3 11.153286 11.153286 11.153286 ZT4-7 9.622021499999999 9.622021499999999 9.622021499999999 ZT8-11 9.766435999999999 9.766435999999999 9.766435999999999 ZT12-15 9.0195195 9.0195195 9.0195195 ZT16-19 8.864610500000001 8.864610500000001 8.864610500000001 ZT20-23 9.146313500000002 9.146313500000002 9.146313500000002