condition mean min max ZT0-3 2.5839999999999996 2.3546699999999996 2.8133299999999997 ZT4-7 3.3427249999999997 3.3427249999999997 3.3427249999999997 ZT8-11 3.79568 3.79568 3.79568 ZT12-15 0 0 0 ZT16-19 4.0990850000000005 4.0990850000000005 4.0990850000000005 ZT20-23 3.61763 3.61763 3.61763