condition mean min max ZT0-3 2.29629755725 0.0 4.5925951145 ZT4-7 8.500184794749998 8.1213436875 8.879025901999999 ZT8-11 14.981134272250003 10.379369824500001 19.582898720000003 ZT12-15 31.1368949975 24.26626401 38.007525985 ZT16-19 68.68091416749999 55.299804045 82.06202429 ZT20-23 83.519796705 81.19409197 85.84550143999999