condition mean min max ZT0-3 11.699714 11.699714 11.699714 ZT4-7 12.1506775 12.1506775 12.1506775 ZT8-11 12.0569165 12.0569165 12.0569165 ZT12-15 11.5802215 11.5802215 11.5802215 ZT16-19 11.4403025 11.4403025 11.4403025 ZT20-23 11.6425015 11.6425015 11.6425015