condition mean min max ZT0-3 10.5015 10.38505 10.61795 ZT4-7 9.36702 9.36702 9.36702 ZT8-11 11.23 11.23 11.23 ZT12-15 0 0 0 ZT16-19 11.300550000000001 11.300550000000001 11.300550000000001 ZT20-23 12.31705 12.31705 12.31705