condition mean min max ZT0-3 12.215867 12.215867 12.215867 ZT4-7 10.042857999999999 10.042857999999999 10.042857999999999 ZT8-11 9.641264 9.641264 9.641264 ZT12-15 8.951309 8.951309 8.951309 ZT16-19 11.6917065 11.6917065 11.6917065 ZT20-23 11.2589515 11.2589515 11.2589515