condition mean min max ZT0-3 3.7044079874999998 2.975715184 4.433100791 ZT4-7 5.390328135 4.649861339999999 6.13079493 ZT8-11 5.324227623500001 4.9815953045 5.6668599425 ZT12-15 5.51608225575 4.1337732135000005 6.898391298 ZT16-19 7.59692818075 7.5708712735 7.622985087999999 ZT20-23 10.511047096999999 9.524311499 11.497782695