condition mean min max ZT0-3 3.0038300000000002 2.170445 3.8372150000000005 ZT4-7 3.8881949999999996 3.8881949999999996 3.8881949999999996 ZT8-11 2.39629 2.39629 2.39629 ZT12-15 0 0 0 ZT16-19 3.190115 3.190115 3.190115 ZT20-23 2.5479399999999996 2.5479399999999996 2.5479399999999996