condition mean min max ZT0-3 2.8499999999999996 2.8499999999999996 2.8499999999999996 ZT4-7 3.0 3.0 3.0 ZT8-11 3.85 3.85 3.85 ZT12-15 9.7 9.7 9.7 ZT16-19 24.349999999999998 24.349999999999998 24.349999999999998 ZT20-23 4.7 4.7 4.7