condition mean min max ZT0-3 1.87509932825 0.10403735 3.6461613065 ZT4-7 6.80351264175 6.7899362665 6.817089017 ZT8-11 2.9908986127499997 1.8075327040000002 4.1742645215 ZT12-15 1.5970958122499999 1.5031765474999998 1.6910150769999999 ZT16-19 4.03203662075 2.9559197514999997 5.108153489999999 ZT20-23 7.5208004695 5.277934740499999 9.763666198500001