condition mean min max ZT0-3 2.24546422975 1.896334225 2.5945942345 ZT4-7 7.6666879475 2.0856979955 13.2476778995 ZT8-11 43.2836289575 30.82705703 55.740200885 ZT12-15 66.7735352725 63.740996335000006 69.80607420999999 ZT16-19 56.2940864175 55.625253605 56.96291923 ZT20-23 57.056286687500005 51.103105935 63.00946744