condition mean min max ZT0-3 117.561869 117.561869 117.561869 ZT4-7 99.84269549999999 99.84269549999999 99.84269549999999 ZT8-11 75.9022405 75.9022405 75.9022405 ZT12-15 101.896536 101.896536 101.896536 ZT16-19 87.155174 87.155174 87.155174 ZT20-23 77.449928 77.449928 77.449928