condition mean min max ZT0-3 603.8 603.8 603.8 ZT4-7 717.3 717.3 717.3 ZT8-11 809.0 809.0 809.0 ZT12-15 1017.8499999999999 1017.8499999999999 1017.8499999999999 ZT16-19 1173.45 1173.45 1173.45 ZT20-23 859.85 859.85 859.85