condition mean min max ZT0-3 1595.68874 1595.68874 1595.68874 ZT4-7 1996.6901905 1996.6901905 1996.6901905 ZT8-11 2300.069866 2300.069866 2300.069866 ZT12-15 2939.0723135 2939.0723135 2939.0723135 ZT16-19 2262.1452245 2262.1452245 2262.1452245 ZT20-23 2455.5161035 2455.5161035 2455.5161035