| Image letter (Figure 1) | City: mean rankings | ||||
---|---|---|---|---|---|---|
 |  | Newcastle (N = 741) Fluoridated | Manchester (N = 812) Non-fluoridated | Total (1553) | Independent Samples t-test (between cities) | |
 |  |  |  |  | P value | 95% CI |
 |  | Mean (S.D.) | Mean (S.D.) | Mean (S.D.) |  |  |
Very White Teeth | a | 1.07 (0.452) | 1.07 (0.536) | 1.07 (0.497) | 0.948 | (-0.048, 0.051) |
Vita shade A1 | b | 2.32 (0.945) | 2.34 (1.031) | 2.33 (0.991) | 0.678 | (-0.120, 0.078) |
Fluorosis TF1 | c | 4.17 (1.529) | 4.47 (1.618) | 4.33 (1.583) | < 0.001* | (- 0.451, - 0.137) |
Medium demarcated opacity | g | 4.55 (1.547) | 4.48 (1.665) | 4.51 (1.61) | 0.406 | (-0.092, 0.228) |
Fluorosis TF2 | d | 5.22 (1.620) | 5.54 (1.678) | 5.39 (1.658) | < 0.001* | (- 0.485, - 0.156) |
Vita A1 chipped incisal edge | i | 5.75 (2.28) | 5.43 (2.285) | 5.59 (2.287) | < 0.005* | (0.01, 0.554) |
Fluorosis TF3 | e | 6.63 (1.512) | 6.81 (1.504) | 6.72 (1.51) | 0.018 | (-0.332, -0.032) |
Fluorosis TF4 | f | 7.92 (1.453) | 7.99 (1.639) | 7.95 (1.553) | 0.374 | (-0.225, 0.085) |
Large demarcated opacity | h | 8.58 (1.395) | 8.47 (1.523) | 8.52 (1.464) | 0.132 | (-0.034, 0.258) |
Teeth with Caries | j | 8.79 (1.614) | 8.41 (1.901) | 8.59 (1.78) | < 0.001* | ( 0.203, 0.556) |
 | Image letter (Fig 1) | Deprivation: mean rankings | ||||
 |  | Lowest Quartile Deprivation (n = 308) | Highest Quartile Deprivation (n = 325) | Independent Samples t-test (between deprivation quartiles) | ||
 |  | Mean (S.D.) | Mean (S.D.) | P value | 95% CI | |
Very White Teeth | a | 1.10 (0.689) | 1.09 (0.612) | 0.931 | (-0.081, 0.089) | |
Vita shade A1 | b | 2.38 (1.089) | 2.40 (1.006) | 0.403 | (-0.210, 0.085) | |
Fluorosis TF1 | c | 4.23 (1.556) | 4.37 (1.640) | 0.379 | (-0.334, 0.127) | |
Medium demarcated opacity | g | 4.21 (1.514) | 4.62 (1.705) | 0.001* | (- 0.633, - 0.158) | |
Fluorosis TF2 | d | 5.55 (1.557) | 5.36 (1.733) | 0.131 | (-0.55, 0.419) | |
Vita A1 chipped incisal edge | i | 5.92 (2.365) | 5.30 (2.223) | 0.001* | (0.253, 0.969) | |
Fluorosis TF3 | e | 6.60 (1.497) | 6.77 (1.511) | 0.154 | (0.369, 0.058) | |
Fluorosis TF4 | f | 8.02 (1.486) | 7.99 (1.476) | 0.191 | (-0.069, 0.348) | |
Large demarcated opacity | h | 8.38 (1.513) | 8.63 (1.484) | 0.072 | (-0.405, 0.017) | |
Teeth with Caries | j | 8.61 (1.836) | 8.46 (1.855) | 0.447 | (-0.158, 0.359) |