condition mean min max ZT0-3 5.4385775 4.56611 6.311045 ZT4-7 10.545805 10.545805 10.545805 ZT8-11 19.5682 19.5682 19.5682 ZT12-15 0 0 0 ZT16-19 15.534099999999999 15.534099999999999 15.534099999999999 ZT20-23 8.951615 8.951615 8.951615