Table 4 Frequency counts for subject DMFT status and comparison between cities for both clinical and photographic scores
| Â | City | |||
|---|---|---|---|---|
| Â | Clinical | Photo | ||
| Â | Newcastle Fluoridated (910) | Manchester Non-fluoridated (873) | Newcastle Fluoridated (910) | Manchester Non-fluoridated (873) |
Caries D 1-6 MFT (white spot lesion) | Â | Â | Â | Â |
0 | 228 (25%) | 133 (15%) | 298 (33%) | 177 (20%) |
1 | 115 (13%) | 78 (9%) | 136 (15%) | 134 (15%) |
2 | 115 (13%) | 92 (10%) | 120 (13%) | 112 (13%) |
3 | 88 (10%) | 103 (12%) | 87 (10%) | 95 (11%) |
4 | 169 (19%) | 132 (15%) | 90 (10%) | 91 (10%) |
5 | 67 (7%) | 53 (6%) | 49 (5%) | 63 (7%) |
6+ | 128 (14%) | 283 (32%) | 130 (14%) | 201 (23%) |
| Â | Mann Whitney U | Mann Whitney U | ||
|  | U = 303698, z = −8.683, p < 0.0001 | U = 326578, z = −6.950, p < 0.0001 | ||
Caries D 4-6 MFT (caries into dentine) | Â | Â | Â | Â |
0 | 614 (68%) | 473 (54%) | 626 (69%) | 475 (54%) |
1 | 134 (15%) | 149 (17%) | 144 (16%) | 165 (19%) |
2 | 86 (10%) | 111 (13%) | 77 (9%) | 112 (13%) |
3 | 37 (4%) | 58 (7%) | 36 (4%) | 59 (7%) |
4 | 25 (3%) | 52 (6%) | 18 (2%) | 44 (5%) |
5 | 10 (1%) | 18 (2%) | 6 (1%) | 8 (1%) |
6+ | 3 (0.4%) | 4 (1%) | 3 (0.3%) | 10 (1%) |
| Â | Mann Whitney U | Mann Whitney U | ||
|  | U = 337110, z = −6.300, p < 0.0001 | U = 333436, z = −6.741, p < 0.0001 | ||