condition mean min max ZT0-3 7.91766102025 6.9336036215 8.901718419 ZT4-7 5.42893049425 3.7680389964999996 7.089821992000001 ZT8-11 11.0631582195 8.571124168999999 13.55519227 ZT12-15 9.496648206749999 8.258913279 10.7343831345 ZT16-19 8.00558578375 6.952352361499999 9.058819206 ZT20-23 13.259083242500001 11.656004075 14.86216241