condition mean min max ZT0-3 16.18775 14.82075 17.55475 ZT4-7 25.04695 25.04695 25.04695 ZT8-11 28.3156 28.3156 28.3156 ZT12-15 0 0 0 ZT16-19 34.70985 34.70985 34.70985 ZT20-23 30.57405 30.57405 30.57405