condition mean min max ZT0-3 0.03406155 0.03406155 0.03406155 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0066474 0.0066474 0.0066474 ZT12-15 0.027645549999999998 0.027645549999999998 0.027645549999999998 ZT16-19 0.0069156 0.0069156 0.0069156 ZT20-23 0.0 0.0 0.0