condition mean min max ZT0-3 0.3993815 0.3993815 0.3993815 ZT4-7 0.2835925 0.2835925 0.2835925 ZT8-11 0.23567500000000002 0.23567500000000002 0.23567500000000002 ZT12-15 0.406119 0.406119 0.406119 ZT16-19 0.525193 0.525193 0.525193 ZT20-23 0.545682 0.545682 0.545682