condition mean min max ZT0-3 1.69412825 1.0451365 2.34312 ZT4-7 2.382835 2.382835 2.382835 ZT8-11 2.1391400000000003 2.1391400000000003 2.1391400000000003 ZT12-15 0 0 0 ZT16-19 1.8610849999999999 1.8610849999999999 1.8610849999999999 ZT20-23 1.5762 1.5762 1.5762