condition mean min max ZT0-3 1.4788375 1.232355 1.72532 ZT4-7 1.802625 1.802625 1.802625 ZT8-11 1.9523350000000002 1.9523350000000002 1.9523350000000002 ZT12-15 0 0 0 ZT16-19 3.88732 3.88732 3.88732 ZT20-23 2.487045 2.487045 2.487045