condition mean min max ZT0-3 0.755187 0.755187 0.755187 ZT4-7 0.628656 0.628656 0.628656 ZT8-11 0.0664655 0.0664655 0.0664655 ZT12-15 0.16748145 0.16748145 0.16748145 ZT16-19 0.0 0.0 0.0 ZT20-23 0.5447649999999999 0.5447649999999999 0.5447649999999999