condition mean min max ZT0-3 21.216 21.216 21.216 ZT4-7 30.099600000000002 30.099600000000002 30.099600000000002 ZT8-11 24.00855 24.00855 24.00855 ZT12-15 11.66695 11.66695 11.66695 ZT16-19 9.384599999999999 9.384599999999999 9.384599999999999 ZT20-23 10.106555 10.106555 10.106555