condition mean min max ZT0-3 15.041327414000001 14.187976038 15.89467879 ZT4-7 7.440905172000001 6.731572121 8.150238223 ZT8-11 8.04560819075 6.68157203 9.4096443515 ZT12-15 11.840551299000001 9.567124378 14.11397822 ZT16-19 10.321890765500001 9.564154601 11.07962693 ZT20-23 12.001264922499999 11.483180265 12.51934958