Parameters | Ordinal scale ratings (mean rank) in six groups | N | Chi-Square | Df | Pb value |
|||||
---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | |||||
Lamina dura delineation | 3.08 | 3.58 | 3.58 | 3.58 | 3.58 | 3.58 | 6 | 5.00 | 5 | 0.42c |
Trabecular pattern depiction | 2.33 | 3.25 | 3.25 | 3.75 | 3.75 | 4.67 | 6 | 8.63 | 5 | 0.13c |
Contrast perception | 3.00 | 3.00 | 3.00 | 3.50 | 4.50 | 4.00 | 6 | 7.50 | 5 | 0.19c |
Bone crater involvement | 3.33 | 3.33 | 3.33 | 3.33 | 3.83 | 3.83 | 6 | 1.11 | 5 | 0.95c |
Furcation defect involvement | 2.83 | 2.33 | 3.83 | 3.33 | 4.33 | 4.33 | 6 | 8.00 | 5 | 0.16c |
aSix groups are combination of two kV settings and three exposure times: 1 = 70 kV, 80 ms; 2 = 63, kV 80 ms; 3 = 70 kV, 120 ms; 4 = 63 kV, 120 ms; 5 = 70 kV, 160 ms; 6 = 63 kV, 160 ms.
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