condition mean min max ZT0-3 11.740672 11.740672 11.740672 ZT4-7 11.8261265 11.8261265 11.8261265 ZT8-11 10.970841 10.970841 10.970841 ZT12-15 12.0102795 12.0102795 12.0102795 ZT16-19 11.9174765 11.9174765 11.9174765 ZT20-23 12.3168925 12.3168925 12.3168925