condition mean min max ZT0-3 10.596775 10.596775 10.596775 ZT4-7 11.244764 11.244764 11.244764 ZT8-11 10.706729500000002 10.706729500000002 10.706729500000002 ZT12-15 10.0915935 10.0915935 10.0915935 ZT16-19 10.1585 10.1585 10.1585 ZT20-23 11.16011 11.16011 11.16011