condition mean min max ZT0-3 17.118792569 15.248030928 18.98955421 ZT4-7 6.39554427425 6.3806927625 6.4103957860000005 ZT8-11 18.91170036775 12.802388415500001 25.02101232 ZT12-15 26.531214022500002 24.2332249 28.829203145 ZT16-19 22.8178385625 22.458818739999998 23.176858385 ZT20-23 23.78032228 21.42768421 26.132960349999998