| Table 1: Comparison of OHI-S score, Russell’s Periodontal Index and gingival bleeding score between study and control group. |
| | | N | Mean | SD | P value |
| | OHI-S Index | Control | 250 | 2.455 | 0.8446 | 0.001* | | Substance abusers | 250 | 2.704 | 0.8228 | | Russell’s Index | Control | 250 | 2.590 | 0.8167 | <0.001** | | Substance abusers | 250 | 3.683 | 1.4022 | | Bleeding on probing | Control | 250 | 22.70 | 5.139 | <0.001** | | Substance abusers | 250 | 9.69 | 7.209 |
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**level of statistical significance of less than .001 with respect to Bleeding index and Russel's periodontal index, *the statistical significance of equal to .001 with respect to OHI-S in relation to substance abuse and clinical parameters governing periodontal disease.
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