condition mean min max ZT0-3 31.251393485 25.50966264 36.99312433 ZT4-7 11.9305085575 11.22217157 12.638845544999999 ZT8-11 16.75638006125 10.9974365775 22.515323545 ZT12-15 23.770566452500002 23.299745010000002 24.241387895000003 ZT16-19 21.8210093 19.633814219999998 24.008204380000002 ZT20-23 18.935082155 18.441597205 19.428567105