condition mean min max ZT0-3 121.001288 121.001288 121.001288 ZT4-7 69.87419750000001 69.87419750000001 69.87419750000001 ZT8-11 51.5733325 51.5733325 51.5733325 ZT12-15 56.230084 56.230084 56.230084 ZT16-19 26.150936 26.150936 26.150936 ZT20-23 35.804930999999996 35.804930999999996 35.804930999999996