Effect of a comprehensive plan for periodontal disease care on oral health-related quality of life in patients with periodontal disease in Taiwan.

3.3 Multiple linear regression The results of multiple linear regression for quality of life (scores on the OHIP-14 and WHOQOL-BRIEF) after adjustment for the effects of group, age, and gender showed that: compared with the control group, patients in the experimental group had a negative correlation with the OHIP-14 score (β = −0.91), suggesting that these patients had a better QoL than did the control group but this did not reach statistical significance; compared with the control group, patients in the experimental group showed a positive correlation with scores on the 4 domains of the WHOQOL-BRIEF scale (β = 0.71, 0.23, 1.08, 0.79 for the physical, psychological, social-related and environmental domains, respectively), suggesting that patients in that group had better QoL than the control group but this did not reach statistical significance either.

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