condition mean min max ZT0-3 8.11641 8.11641 8.11641 ZT4-7 7.796175 7.796175 7.796175 ZT8-11 10.771889999999999 10.771889999999999 10.771889999999999 ZT12-15 16.124000000000002 16.124000000000002 16.124000000000002 ZT16-19 14.484449999999999 14.484449999999999 14.484449999999999 ZT20-23 13.9652 13.9652 13.9652