condition mean min max ZT0-3 1011.405243 1011.405243 1011.405243 ZT4-7 1102.649196 1102.649196 1102.649196 ZT8-11 843.7447394999999 843.7447394999999 843.7447394999999 ZT12-15 277.0835715 277.0835715 277.0835715 ZT16-19 85.223284 85.223284 85.223284 ZT20-23 105.3174765 105.3174765 105.3174765