condition mean min max ZT0-3 11.232226 11.232226 11.232226 ZT4-7 13.242296 13.242296 13.242296 ZT8-11 12.685846 12.685846 12.685846 ZT12-15 12.4422585 12.4422585 12.4422585 ZT16-19 12.9133255 12.9133255 12.9133255 ZT20-23 11.705164 11.705164 11.705164