condition mean min max ZT0-3 5.92978 5.92978 5.92978 ZT4-7 4.69568 4.69568 4.69568 ZT8-11 2.809755 2.809755 2.809755 ZT12-15 2.61719 2.61719 2.61719 ZT16-19 2.29031 2.29031 2.29031 ZT20-23 3.9198700000000004 3.9198700000000004 3.9198700000000004