condition mean min max ZT0-3 2.8283899999999997 2.4208749999999997 3.235905 ZT4-7 1.742365 1.742365 1.742365 ZT8-11 1.845 1.845 1.845 ZT12-15 0 0 0 ZT16-19 2.1686300000000003 2.1686300000000003 2.1686300000000003 ZT20-23 2.710175 2.710175 2.710175