condition mean min max ZT0-3 22.946475771 19.612697982 26.28025356 ZT4-7 3.8371912015 2.935582076 4.738800327 ZT8-11 4.8872308349999996 3.4933008344999994 6.2811608355 ZT12-15 10.215099909 7.2959498125 13.1342500055 ZT16-19 11.6600904685 9.455121097 13.86505984 ZT20-23 24.61579058 23.711002625 25.520578535