condition mean min max ZT0-3 5.8523724999999995 5.3799399999999995 6.324805 ZT4-7 3.7842450000000003 3.7842450000000003 3.7842450000000003 ZT8-11 3.522775 3.522775 3.522775 ZT12-15 0 0 0 ZT16-19 2.96489 2.96489 2.96489 ZT20-23 6.2763 6.2763 6.2763