M Beerens

32 CHAPTER 2 Table 2. Number and percentage of buccal surfaces with WSL detected at T1 and T2 on clinical and QLF photographs. Surfaces QLF Clinical photographs  [N] [%] [N] [%] Affected at T1 384 41.8 433 47.2 Affected at T2 341 37.1 339 36.9 Total 918 100 918 100 Table 3. Cross-tables showing the comparison of ICDAS and Visual Transition scores with respective QLF scores at T1 and T2. ICDAS QLF Total 0 1 2 3 T1 T1 T2 0 2 0 2 3 4 0 2 3 4 2 3 4 T2 0 0 386 2 21 37  1  447 2 27  7 1  1 2  38 2 0 70 1 13 32 2  1 7 5  131 2 44 4 14 103 12 1 1 33 33 7  12 7 271 3 1 2 1  1 8 1  4 9 27 3 0 1  1 Restoration  1  1 3 1  1 4 1 1 Total 527 7 48 180 17 2 2 43 49 9 1 16 17 918 Visual transition QLF Total 0 1 2 3 T1 T1 T2 0 2 0 2 3 4 0 2 3 4 2 3 4 T2 0 Same 386 2 21 37  1  447 Worse 27  7 1  1 2  38 2 Improve 83 3 21 90 4 1 2 27 23 3  8 3 268 Same 26 2 6 39 6  12 11 2  3 2 109 Worse 5  7 6 1  2 12 3  5 11 52 3 Improve 1  1 Restoration  1  1 Same 0 Worse 1  1 2 Total 527 7 48 180 17 2 2 43 49 9 1 16 17 918