condition mean min max ZT0-3 0.11445955149999999 0.0 0.22891910299999998 ZT4-7 2.68098853675 0.9342496745 4.427727399 ZT8-11 11.140996774 10.048013153 12.233980395 ZT12-15 13.59118957 12.2018971 14.980482039999998 ZT16-19 14.225561285000001 13.091570655 15.359551915 ZT20-23 20.935418877500002 19.629941975 22.240895780000002