condition mean min max ZT0-3 1.1587750442499998 0.293865499 2.0236845894999997 ZT4-7 5.4793923190000005 4.269903943499999 6.688880694500001 ZT8-11 11.027155074500001 9.648959327500002 12.4053508215 ZT12-15 21.662253972500004 20.031569985 23.292937960000003 ZT16-19 15.6164947425 14.860112045000001 16.37287744 ZT20-23 11.061368855 10.707242879999999 11.41549483