condition mean min max ZT0-3 0.03262525 0.03262525 0.03262525 ZT4-7 0.01513565 0.01513565 0.01513565 ZT8-11 0.0164236 0.0164236 0.0164236 ZT12-15 0.0 0.0 0.0 ZT16-19 0.026370249999999998 0.026370249999999998 0.026370249999999998 ZT20-23 0.0195645 0.0195645 0.0195645