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A Comprehensive Index for the Modeling of Smoking History in Periodontal Research
Th. Dietrich1,2,3,4,* and
K. Hoffmann1
1 Dept. of Epidemiology, German Institute of Human Nutrition, Nuthetal, Germany;
2 Dept. of Periodontology and
3 Dept. of Oral Surgery, Charité, Humboldt University of Berlin, Berlin, Germany; and
4 Dept. of Health Policy & Health Services Research, Goldman School of Dental Medicine, Boston University, 715 Albany St., 560 3rd floor, Boston, MA 02118, USA;

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Figure. Smoothed quantile plot of log-transformed CSI for former smokers (solid line) and different categories of current smokers [0–10 cig/day (long dashes), 11–20 cig/day (medium dashes), 21–30 cig/day (short dashes), and > 30 cig/day (dots)].
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Journal of Dental Research, Vol. 83, No. 11,
859-863 (2004)
DOI: 10.1177/154405910408301107

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