condition mean min max ZT0-3 3.44604 3.31247 3.5796099999999997 ZT4-7 5.76661 5.76661 5.76661 ZT8-11 6.07249 6.07249 6.07249 ZT12-15 0 0 0 ZT16-19 7.68215 7.68215 7.68215 ZT20-23 5.838229999999999 5.838229999999999 5.838229999999999