condition mean min max ZT0-3 0.0079509 0.0 0.0159018 ZT4-7 0.0107981 0.0107981 0.0107981 ZT8-11 0.0271048 0.0271048 0.0271048 ZT12-15 0 0 0 ZT16-19 0.015910849999999997 0.015910849999999997 0.015910849999999997 ZT20-23 0.0373102 0.0373102 0.0373102