condition mean min max ZT0-3 4.44495549775 4.2236774135 4.666233582 ZT4-7 2.74915479525 2.7159356645 2.782373926 ZT8-11 2.4429148542499997 2.1167182355 2.7691114729999997 ZT12-15 4.3231386965 3.2306885525 5.4155888405 ZT16-19 5.09598139875 4.2332060904999995 5.958756707 ZT20-23 9.2934813215 8.5737905085 10.0131721345