This is because of a lack of available data on some potentially important factors, such as fitness; the availability of only limited measures of others (for example, physical activity was self reported and captured only leisure time activity); and our decision a priori not to include other measures, such as nutritional intake and alcohol consumption.
The estimative of nutritional intake revealed that folate consumption median was inadequate in both groups, whereas methionine and zinc consumption medians were significantly greater in control mothers.
The initial months are then focused on consumption support to stabilize the nutritional intake.
Mothers of all live-born twins during the study period were approached after birth for data collection, including nutritional supplement consumption during pregnancy.
Despite problems related to their accuracy, national food balance sheets and nutritional and/for consumption surveys are the most readily available sources for such in formation.
Patients were asked to fill out a questionnaire containing items concerning: oral hygiene habits (tooth brushing, use of mouth wash, and use of dental floss), nutritional habits (daily consumption of fresh fruits and vegetables), and history of recurrent nontraumatic oral ulceration.
To ascertain whether diet was associated with alterations in nutritional performance, food consumption and water intake were measured daily.
These included the characteristics presented in Table 1, as well as additional nutritional factors, including consumption of red meat and intake of added fat.
The questionnaire consisted of sociodemographic variables, lifetime occupational history, use of nasal snuff, smoking, exposure to environmental tobacco smoke, diseases of the nose, previous malignancies, family history of malignancies, nutritional habits including consumption of alcohol, specific exposures (use of insecticides in homes, organic solvents).
