condition mean min max ZT0-3 13.748756 13.748756 13.748756 ZT4-7 13.8177235 13.8177235 13.8177235 ZT8-11 13.748756 13.748756 13.748756 ZT12-15 12.2051675 12.2051675 12.2051675 ZT16-19 13.8926235 13.8926235 13.8926235 ZT20-23 13.949448499999999 13.949448499999999 13.949448499999999