condition mean min max ZT0-3 6.7949059195 6.041760269 7.54805157 ZT4-7 3.9940093525000004 3.273371491 4.714647214000001 ZT8-11 5.9801714115 4.513390584 7.446952239 ZT12-15 10.710388917749999 9.989719555499999 11.43105828 ZT16-19 13.50431025 12.25626553 14.752354969999999 ZT20-23 11.9542506235 11.276304087 12.63219716