condition mean min max ZT0-3 19.504566666666665 13.868549999999999 22.4321 ZT4-7 15.47195 15.47195 15.47195 ZT8-11 17.2959 17.2959 17.2959 ZT12-15 24.067300000000003 23.75495 24.37965 ZT16-19 22.97365 22.97365 22.97365 ZT20-23 27.85915 27.85915 27.85915