condition mean min max ZT0-3 38.732232 38.732232 38.732232 ZT4-7 36.901951 36.901951 36.901951 ZT8-11 34.0406845 34.0406845 34.0406845 ZT12-15 35.966442 35.966442 35.966442 ZT16-19 36.908161500000006 36.908161500000006 36.908161500000006 ZT20-23 39.160402000000005 39.160402000000005 39.160402000000005