condition mean min max ZT0-3 19.1663 18.83115 19.50145 ZT4-7 13.4176 13.4176 13.4176 ZT8-11 13.0384 13.0384 13.0384 ZT12-15 0 0 0 ZT16-19 16.43375 16.43375 16.43375 ZT20-23 20.5437 20.5437 20.5437