condition mean min max ZT0-3 65.692489185 53.36899908 78.01597929 ZT4-7 51.8530902775 43.390072355 60.3161082 ZT8-11 103.56253217 77.52166014 129.6034042 ZT12-15 72.5221684 47.07889338 97.96544342000001 ZT16-19 35.04207365 33.40711365 36.67703365 ZT20-23 24.3357411975 24.098478 24.573004394999998