condition mean min max ZT0-3 0.2759173166666667 0.15599095000000002 0.3623135 ZT4-7 0.5273275000000001 0.5273275000000001 0.5273275000000001 ZT8-11 2.4295850000000003 2.4295850000000003 2.4295850000000003 ZT12-15 1.6085160000000003 0.956787 2.2602450000000003 ZT16-19 0.7587375000000001 0.7587375000000001 0.7587375000000001 ZT20-23 0.659153 0.659153 0.659153