condition mean min max ZT0-3 3.30971 1.199835 4.382905 ZT4-7 1.0618699999999999 1.0618699999999999 1.0618699999999999 ZT8-11 1.825935 1.825935 1.825935 ZT12-15 3.6141675 3.434845 3.7934900000000003 ZT16-19 4.609105 4.609105 4.609105 ZT20-23 6.236075 6.236075 6.236075