condition mean min max ZT0-3 38.340957 38.340957 38.340957 ZT4-7 40.9376995 40.9376995 40.9376995 ZT8-11 52.290025 52.290025 52.290025 ZT12-15 61.595983 61.595983 61.595983 ZT16-19 70.3844615 70.3844615 70.3844615 ZT20-23 49.2768135 49.2768135 49.2768135