condition mean min max ZT0-3 15.5664 15.5664 15.5664 ZT4-7 11.848993 11.848993 11.848993 ZT8-11 11.681359 11.681359 11.681359 ZT12-15 10.772344499999999 10.772344499999999 10.772344499999999 ZT16-19 10.6359385 10.6359385 10.6359385 ZT20-23 11.239598 11.239598 11.239598