condition mean min max ZT0-3 2.3852325 2.330425 2.4400399999999998 ZT4-7 2.11966 2.11966 2.11966 ZT8-11 2.3359550000000002 2.3359550000000002 2.3359550000000002 ZT12-15 0 0 0 ZT16-19 2.5222800000000003 2.5222800000000003 2.5222800000000003 ZT20-23 2.01003 2.01003 2.01003