condition mean min max ZT0-3 65.147424 65.147424 65.147424 ZT4-7 23.6367925 23.6367925 23.6367925 ZT8-11 18.575163500000002 18.575163500000002 18.575163500000002 ZT12-15 14.0702575 14.0702575 14.0702575 ZT16-19 18.835201 18.835201 18.835201 ZT20-23 30.419106499999998 30.419106499999998 30.419106499999998