title: The chi-square test for trend.
authors.affiliation: Postgraduate student, London School of Hygiene and Tropical Medicine, University of London, London, United Kingdom; private practice, Athens, Greece.
authors.forename: Despina
authors.initials: D
authors.lastname: Koletsi
authors.affiliation: Assistant professor, Department of Orthodontics and Dentofacial Orthopedics, School of Dental Medicine/Medical Faculty, University of Bern, Bern, Switzerland; private practice, Corfu, Greece.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Pandis
mesh_terms: D016009:Chi-Square Distribution; D003627:Data Interpretation, Statistical; D005891:Gingivitis / Q000517:prevention & control; D006801:Humans; D015233:Models, Statistical; D009067:Mouthwashes / Q000627:therapeutic use
chemical_list: D009067:Mouthwashes