condition mean min max ZT0-3 54.6485 54.6485 54.6485 ZT4-7 54.25565 54.25565 54.25565 ZT8-11 29.30905 29.30905 29.30905 ZT12-15 21.1947 21.1947 21.1947 ZT16-19 21.48635 21.48635 21.48635 ZT20-23 33.05465 33.05465 33.05465