condition mean min max ZT0-3 73.02285419 50.37588288 95.6698255 ZT4-7 15.8531306675 14.76758534 16.938675995 ZT8-11 18.062004815 14.26960464 21.85440499 ZT12-15 24.076994532500002 20.023224005 28.13076506 ZT16-19 26.1708833275 26.014456505 26.32731015 ZT20-23 28.9109994625 27.14670396 30.675294965