condition mean min max ZT0-3 4.738519999999999 4.738519999999999 4.738519999999999 ZT4-7 2.5047699999999997 2.5047699999999997 2.5047699999999997 ZT8-11 7.657305 7.657305 7.657305 ZT12-15 14.6065 14.6065 14.6065 ZT16-19 12.358450000000001 12.358450000000001 12.358450000000001 ZT20-23 7.0303 7.0303 7.0303