condition mean min max ZT0-3 0.0645302 0.0 0.1104425 ZT4-7 0.02584925 0.02584925 0.02584925 ZT8-11 0.0544675 0.0544675 0.0544675 ZT12-15 0.026817175 0.0264854 0.02714895 ZT16-19 0.02630425 0.02630425 0.02630425 ZT20-23 0.02966085 0.02966085 0.02966085