condition mean min max ZT0-3 40.280131471666664 26.82926517 53.730997773333335 ZT4-7 71.03784769 66.05953429 76.01616109 ZT8-11 71.72790958499999 67.31614326 76.13967591 ZT12-15 56.74642986 49.47692295666667 64.01593676333333 ZT16-19 26.20535585 20.59926186 31.81144984 ZT20-23 19.41283045833333 15.75802818 23.067632736666667