condition mean min max ZT0-3 1098.794975 1098.794975 1098.794975 ZT4-7 1141.8541035 1141.8541035 1141.8541035 ZT8-11 1113.481968 1113.481968 1113.481968 ZT12-15 1186.9957494999999 1186.9957494999999 1186.9957494999999 ZT16-19 1054.1320015000001 1054.1320015000001 1054.1320015000001 ZT20-23 704.7610285000001 704.7610285000001 704.7610285000001