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 |