condition mean min max ZT0-3 15.69585 15.69585 15.69585 ZT4-7 16.0989 16.0989 16.0989 ZT8-11 10.528334999999998 10.528334999999998 10.528334999999998 ZT12-15 14.099599999999999 14.099599999999999 14.099599999999999 ZT16-19 18.02565 18.02565 18.02565 ZT20-23 15.482600000000001 15.482600000000001 15.482600000000001