condition mean min max ZT0-3 2.692165 1.68863 3.6957000000000004 ZT4-7 1.94395 1.94395 1.94395 ZT8-11 1.363795 1.363795 1.363795 ZT12-15 0 0 0 ZT16-19 5.549379999999999 5.549379999999999 5.549379999999999 ZT20-23 9.485385 9.485385 9.485385