condition mean min max ZT0-3 90.179172 90.179172 90.179172 ZT4-7 98.694418 98.694418 98.694418 ZT8-11 106.84527 106.84527 106.84527 ZT12-15 89.5207155 89.5207155 89.5207155 ZT16-19 118.023795 118.023795 118.023795 ZT20-23 137.971088 137.971088 137.971088