condition mean min max ZT0-3 1457.770518 1457.770518 1457.770518 ZT4-7 1704.9258675 1704.9258675 1704.9258675 ZT8-11 1879.736045 1879.736045 1879.736045 ZT12-15 1735.9751495 1735.9751495 1735.9751495 ZT16-19 1080.228024 1080.228024 1080.228024 ZT20-23 453.62618150000003 453.62618150000003 453.62618150000003