condition mean min max ZT0-3 53.314275 51.49665 55.1319 ZT4-7 57.8485 57.8485 57.8485 ZT8-11 121.771 121.771 121.771 ZT12-15 0 0 0 ZT16-19 119.964 119.964 119.964 ZT20-23 83.0192 83.0192 83.0192