condition mean min max ZT0-3 5413.416504 5413.416504 5413.416504 ZT4-7 4617.323754999999 4617.323754999999 4617.323754999999 ZT8-11 3544.647578 3544.647578 3544.647578 ZT12-15 4200.2327155 4200.2327155 4200.2327155 ZT16-19 3888.609161 3888.609161 3888.609161 ZT20-23 3225.416945 3225.416945 3225.416945