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At enrollment, both partners were interviewed about demographic, occupational, lifestyle, and psychological characteristics using standardized questionnaires. Multivariable generalized linear mixed models with Poisson distribution were used to estimate the adjusted percent difference in SIF across exposure categories.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Outcomes<\/jats:title>\n                  <jats:p>SIF was recorded in daily journals and summarized as average SIF\/mo.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>The median (interquartile range) SIF during follow-up was 6 (4\u20139) acts\/mo. For every year increase in age for women and men, SIF decreased by \u20130.8% (95% CI \u20132.5 to 1.0%) and \u20131.7% (95% CI \u20133.1 to \u20130.3%). Women with high school education or less and those of non-white race had 34.4% and 16.0% higher SIF, respectively. A similar trend was seen for men's education and race. Only couples where both partners (but not just 1 partner) worked rotating shifts had \u201339.1% (95% CI \u201361.0 to \u20135.0%) lower SIF compared to couples where neither partner worked rotating shifts. Men's (but not women's) exercise was associated with 13.2% (95% CI 1.7\u201326.0%) higher SIF. Diagnosis of a mood or anxiety disorder in men (but not women) was associated with a 26.0% (95% CI \u201342.7 to \u20134.4%) lower SIF. Household income, smoking status, body mass index, night work, alcohol intake, and psychosocial stress were not associated with SIF.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Clinical Translation<\/jats:title>\n                  <jats:p>Even among couples trying to conceive, there was substantial variation in SIF. Both partners' age, education, race, and rotating shift work as well as men's exercise and mental health play an important role in determining SIF.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>As this was a secondary analysis of an existing study, we lacked information on many pertinent psychological and relationship quality variables and the hormonal status of participants, which could have affected SIF. The unique population-based couple design, however, captured both partners' demographics, occupational characteristics, and lifestyle behaviors in advance of their daily, prospective reporting of SIF, which was a major strength. Important predictors of SIF among couples attempting to conceive include men's exercise and mental health and both partners' age, education, race, and rotating shift work.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1016\/j.jsxm.2018.02.005","type":"journal-article","created":{"date-parts":[[2018,3,6]],"date-time":"2018-03-06T14:05:08Z","timestamp":1520345108000},"page":"519-528","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":29,"title":["Predictors of Sexual Intercourse Frequency Among Couples Trying to Conceive"],"prefix":"10.1093","volume":"15","author":[{"given":"Audrey J.","family":"Gaskins","sequence":"first","affiliation":[{"name":"Department of Nutrition , Boston, MA , USA"},{"name":"Harvard T.H. Chan School of Public Health , Boston, MA , USA"},{"name":"Channing Division of Network Medicine , Boston, MA , USA"},{"name":"Department of Medicine , Boston, MA , USA"},{"name":"Brigham and Women's Hospital and Harvard Medical School , Boston, MA , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajeshwari","family":"Sundaram","sequence":"additional","affiliation":[{"name":"Division of Intramural Population Health Research , Bethesda, MD , USA"},{"name":"Eunice Kennedy Shriver National Institute of Child Health and Human Development , Bethesda, MD , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Germaine M.","family":"Buck Louis","sequence":"additional","affiliation":[{"name":"Division of Intramural Population Health Research , Bethesda, MD , USA"},{"name":"Eunice Kennedy Shriver National Institute of Child Health and Human Development , Bethesda, MD , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jorge E.","family":"Chavarro","sequence":"additional","affiliation":[{"name":"Department of Nutrition , Boston, MA , USA"},{"name":"Harvard T.H. Chan School of Public Health , Boston, MA , USA"},{"name":"Department of Epidemiology , Boston, MA , USA"},{"name":"Harvard T.H. Chan School of Public Health , Boston, MA , USA"},{"name":"Channing Division of Network Medicine , Boston, MA , USA"},{"name":"Department of Medicine , Boston, MA , USA"},{"name":"Brigham and Women's Hospital and Harvard Medical School , Boston, MA , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2018,3,6]]},"reference":[{"key":"2023012309241856600_bib1","doi-asserted-by":"crossref","first-page":"762","DOI":"10.1056\/NEJMoa067423","article-title":"A\u00a0study of sexuality and health among older adults in the United States","volume":"357","author":"Lindau","year":"2007","journal-title":"N\u00a0Engl J Med"},{"key":"2023012309241856600_bib2","doi-asserted-by":"crossref","first-page":"1830","DOI":"10.1016\/S0140-6736(13)62222-9","article-title":"Associations between health and sexual lifestyles in Britain: findings from the third National Survey of Sexual Attitudes and Lifestyles (Natsal-3)","volume":"382","author":"Field","year":"2013","journal-title":"Lancet"},{"key":"2023012309241856600_bib3","doi-asserted-by":"crossref","first-page":"319","DOI":"10.1080\/00926230701385548","article-title":"Women's relationship quality is associated with specifically penile-vaginal intercourse orgasm and frequency","volume":"33","author":"Costa","year":"2007","journal-title":"J\u00a0Sex Marital Ther"},{"key":"2023012309241856600_bib4","doi-asserted-by":"crossref","first-page":"1088","DOI":"10.1093\/aje\/kwk111","article-title":"Effects of sexual intercourse patterns in time to pregnancy studies","volume":"165","author":"Stanford","year":"2007","journal-title":"Am J Epidemiol"},{"key":"2023012309241856600_bib5","doi-asserted-by":"crossref","first-page":"413","DOI":"10.1111\/j.1365-3016.2011.01205.x","article-title":"Designing prospective cohort studies for assessing reproductive and developmental toxicity during sensitive windows of human reproduction and development\u2014the LIFE Study","volume":"25","author":"Buck Louis","year":"2011","journal-title":"Paediatr Perinat Epidemiol"},{"key":"2023012309241856600_bib6","article-title":"Perceived stress in a probability sample of the United States","author":"Cohen","year":"1998","journal-title":"The social psychology of health: Claremont symposium on applied social psychology"},{"key":"2023012309241856600_bib7","article-title":"Chapter 14: Missing data and dropout. 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