condition mean min max ZT0-3 0.44956127324999995 0.37109472299999996 0.5280278235 ZT4-7 0.821254886 0.5358618145 1.1066479575 ZT8-11 2.76522623525 1.9220021729999999 3.6084502975 ZT12-15 3.7123629987499998 3.5949360485 3.829789949 ZT16-19 2.317725916 2.2013652055 2.4340866265 ZT20-23 2.37662489625 2.243895789 2.5093540035000004