condition mean min max ZT0-3 4.47326 4.06207 4.88445 ZT4-7 6.42908 6.42908 6.42908 ZT8-11 5.208914999999999 5.208914999999999 5.208914999999999 ZT12-15 0 0 0 ZT16-19 4.635785 4.635785 4.635785 ZT20-23 5.539339999999999 5.539339999999999 5.539339999999999