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Table 4 Comparison of QLF metrics between cities

From: Evaluating the use of fluorescent imaging for the quantification of dental fluorosis

QLF metric City Mean rank Sum of ranks Mann Whitney U Sig (2-tailed)
Area ch Newcastle (N=905) 1014.67 918274.00 278136.00 P<0.001
Manchester (N=869) 755.06 656151.00
ΔF ch Newcastle (N=905) 976.62 883843.00 312576.00 P<0.001
Manchester (N=869) 794.69 690582.00
ΔQ ch Newcastle (N=905) 1006.98 911320.00 285090.00 P<0.001
Manchester (N=869) 763.07 663105.00