condition mean min max ZT0-3 0.0371566 0.0371566 0.0371566 ZT4-7 0.05162865 0.05162865 0.05162865 ZT8-11 0.0140122 0.0140122 0.0140122 ZT12-15 0.02260655 0.02260655 0.02260655 ZT16-19 0.07508565 0.07508565 0.07508565 ZT20-23 0.05216725 0.05216725 0.05216725