condition mean min max ZT0-3 436.077588 436.077588 436.077588 ZT4-7 333.9514255 333.9514255 333.9514255 ZT8-11 442.210967 442.210967 442.210967 ZT12-15 439.371707 439.371707 439.371707 ZT16-19 436.97123450000004 436.97123450000004 436.97123450000004 ZT20-23 412.0323515 412.0323515 412.0323515