condition mean min max ZT0-3 10.3674 5.6435 14.2777 ZT4-7 3.7905249999999997 3.7905249999999997 3.7905249999999997 ZT8-11 6.344625 6.344625 6.344625 ZT12-15 14.875499999999999 14.5993 15.1517 ZT16-19 14.8412 14.8412 14.8412 ZT20-23 20.9802 20.9802 20.9802