Hodges, James SMichalowicz, Bryan S2013-11-222013-11-222013-11-22https://hdl.handle.net/11299/160551The collected data are documented in the Data Dictionary and the Manual of Practice files. Citations using the data are included in a text file.The OPT Study was a multi-center randomized, single-blind (examiners) controlled clinical trial testing whether mechanical periodontal therapy (scaling and planing) in pregnant women at risk for premature birth reduced the extent or severity of premature birth. OPT found that periodontal therapy does not reduce the number or timing of premature births. Data include birth outcomes (including gestational age, birthweight, presence of congenital anomalies, and 1 and 5 minute APGAR scores), baseline characteristics (including previous pregnancy outcomes), periodontal therapy and essential dental care delivered as part of the study, maternal conditions during pregnancy, and the following items for three visits between the end of the first trimester and delivery: clinical periodontal measurements (pocket depth, attachment loss, and bleeding on probing at 6 sites per tooth; site-specific data and several common person-level summaries), medications, dental plaque levels of 8 bacterial species, levels of serum antibodies for the same 8 bacterial species, and serum levels of 8 inflammatory markers or mediators. The OPT Study's Manual of Procedures (Version 1) is available as part of this package. Version changes during the course of the study were rare and affected very few data items (mostly the data describing study periodontal therapy). The OPT Study team published the main paper in 2006 in the New England Journal of Medicine and has published 8 secondary papers.en-USPeriodontal therapyPre-term birthRandomized controlled trialPeriodontal measurementsPregnant womenDatasethttp://dx.doi.org/10.13020/D6KW2D