The objective of this study was to evaluate the behavioral risks that are associated with human herpesvirus 8 (HHV-8) infection in a cohort of young homosexual men. Seventy-nine subjects (ages 22-33 years) who completed a questionnaire about their sexual and drug use behavior over the preceding year were recruited from the San Francisco Young Men's Health Study. Plasma samples were tested for a...

BACKGROUND Although minimal intervention dentistry (MID) is on the increase, little is known about the patterns of knowledge, attitudes, and behaviors of dentists in the United States. METHODS Federal service and civilian dentists who were active members of the American Dental Association (N = 1,500) received a pretested questionnaire about their knowledge, attitudes, and behaviors concerning...

Objectives: To assess the 2008–2012 Canadian contribution to the Otolaryngology literature. Methods: All articles published from January 2008 December 2012 in 5 Otolaryngology journals were reviewed. Nationality, number of authors, and study type were extracted. The output, number of authors, and study type of Canadian papers were compared to International papers using Mantel-Haenszel Common Od...

Background: Antiseptic scrub and paint can reduce bacterial colonization and postoperative wound infection. Two forms of antiseptics, povidone iodine and chlorhexidine, are commonly used in the operating theater. Objective: To study the efficacy of the reduction of bacterial colonization and surgical wound infection among these antiseptic. Material and Method: Five hundred surgical patients wer...

OBJECTIVE To compare perinatal mortality, stratified for risk level, in home births attended by a relative or traditional birth attendant without formal training with births attended by trained personnel in a dispensary or hospital. STUDY DESIGN A prospective community based study in five villages in Northwestern Tanzania during 1990, involving 222 women delivering at home and 199 in a dispen...

The use of cross-over trials in investigating treatments for infertility is discussed. A simple possible approach to analyzing such trials using the Mantel-Haenszel procedure is explained. A more flexible approach based on the normal-binomial mixture model of Ezzet and Whitehead is examined. It is shown how this may be implemented in various statistical packages by applying it to two real examp...

'Doll R, Gray R, Hafner B, Peto R. Mortality in relation to smoking: 22 years' observation in female British doctors. Br Med3J 1980;i:967-71. 2Hirayama T. Non-smoking wives of heavy smokers have a higher risk of lung cancer: a study in Japan, Br MedJ7 1981;282:183-5. 3Correa P, Pickle LW, Fontham E, Lin Y, Haenszel W. Passive smoking and lung cancer. Lancet 1983;ii:595-7. 4van der Heide RM. Res...

Existing linear rank statistics cannot be applied to cross-sectional survival data without follow-up since all subjects are essentially censored. However, partial survival information are available from backward recurrence times and are frequently collected from health surveys without prospective follow-up. Under length-biased sampling, a class of linear rank statistics is proposed based only o...

Metal-on-metal (MOM) hip articulations represent a potential alternative to conventional metal-on-polyethylene total hip arthroplasty (THA). We performed a systematic review of the peer-reviewed literature in search of studies comparing MOM with conventional primary THA with regard to functional outcomes, radiographic outcomes, and complication rates. Four Level I randomized controlled trials r...

The aim of this study was to determine whether the items from a reading comprehension test in European Portuguese function differently across students from rural and urban areas, which biases the test validity and the equity in assessment. The sample was composed of 653 students from second, third and fourth grades. The presence of differential item functioning (DIF) was analysed using logistic...