condition mean min max ZT0-3 0.981622034 0.7554881 1.207755968 ZT4-7 0.4220121915 0.2759325305 0.5680918525 ZT8-11 0.9189643042500001 0.4771491315 1.3607794770000001 ZT12-15 2.6701682887500002 2.2096183965 3.130718181 ZT16-19 2.4028069162500003 2.3375958385 2.468017994 ZT20-23 2.684184466 2.666230404 2.702138528