condition mean min max ZT0-3 2.4511165915 0.519055909 4.3831772739999995 ZT4-7 8.580788599249999 7.32440818 9.8371690185 ZT8-11 19.308611528500002 14.142515817 24.47470724 ZT12-15 31.326097972499998 30.23644445 32.415751494999995 ZT16-19 25.734307949999998 24.187469749999998 27.281146149999998 ZT20-23 27.917516675 26.554521225000002 29.280512125