condition mean min max ZT0-3 26.13566 26.13566 26.13566 ZT4-7 19.43708 19.43708 19.43708 ZT8-11 30.6982845 30.6982845 30.6982845 ZT12-15 45.9783285 45.9783285 45.9783285 ZT16-19 71.127872 71.127872 71.127872 ZT20-23 63.1555225 63.1555225 63.1555225