Long-term recall of time-to-pregnancy

Joffe, Michael; Villard, Laurence; Li, Zhimin; Plowman, Rosalind; Vessey, Martin

doi:10.1016/s0015-0282(16)56044-0

Cited by 115 publications

(6 citation statements)

References 10 publications

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“…However, TTP is considered easier to remember in retrospective studies than cycle length [39], and previous studies have demonstrated that correcting for menstrual patterns had no impact on effect estimates [40]. Finally, long term recall of TTP can only be roughly estimated compared to prospective studies, however, the use of self-reported time to pregnancy is consistent with that of previous studies, supporting the use of retrospective questionnaires to be accurate in the assessment of TTP in fertile and subfertile couples [18], and show good agreement with prospective recall of TTP [37].…”

Section: Discussionsupporting

confidence: 59%

“…Notably, the use of non-fasting samples for assessment of zinc, selenium and copper have recently been shown to be similar to fasting samples [38]. Potential limitations of retrospective TTP studies have been well described by us [19] and others [17,18] and include the potential for planning bias, medical intervention bias, truncation bias and behaviour change bias. We did not have data on menstrual cycle length which is often utilised alongside defining TTP.…”

Section: Discussionmentioning

confidence: 99%

“…A major challenge in evaluating the effects of certain exposures on fertility lies in recruiting a sufficiently large sample of women prior to pregnancy and following them prospectively. Retrospective time to pregnancy studies which recruit women during pregnancy and ask them to recall exposures prior to conception and the time taken to conceive, have emerged as a valid and informative epidemiological approach to better understanding factors influencing female fertility [17,18]. One limitation of this approach lies in the required assumption that data collected following conception, whether clinical or biological, is reflective of pre-conception exposure status.…”

Section: Introductionmentioning

confidence: 99%

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Maternal Selenium, Copper and Zinc Concentrations in Early Pregnancy, and the Association with Fertility

et al. 2019

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Trace elements such as zinc, copper, and selenium are essential for reproductive health, but there is limited work examining how circulating trace elements may associate with fertility in humans. The aim of this study was to determine the association between maternal plasma concentrations of zinc, copper, and selenium, and time to pregnancy and subfertility. Australian women (n = 1060) who participated in the multi-centre prospective Screening for Pregnancy Endpoints study were included. Maternal plasma concentrations of copper, zinc and selenium were assessed at 15 ± 1 weeks’ gestation. Estimates of retrospectively reported time to pregnancy were documented as number of months to conceive; subfertility was defined as taking more than 12 months to conceive. A range of maternal and paternal adjustments were included. Women who had lower zinc (time ratio, 1.20 (0.99–1.44)) or who had lower selenium concentrations (1.19 (1.01–1.40)) had a longer time to pregnancy, equivalent to a median difference in time to pregnancy of around 0.6 months. Women with low selenium concentrations were also at a 1.46 (1.06–2.03) greater relative risk for subfertility compared to women with higher selenium concentrations. There were no associations between copper and time to pregnancy or subfertility. Lower selenium and zinc trace element concentrations, which likely reflect lower dietary intakes, associate with a longer time to pregnancy. Further research supporting our work is required, which may inform recommendations to increase maternal trace element intake in women planning a pregnancy.

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Section: Discussionsupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maternal Selenium, Copper and Zinc Concentrations in Early Pregnancy, and the Association with Fertility

et al. 2019

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“…As in all retrospective studies, there is concern for recall bias in self-reported data. However, previous studies have shown that personal reproductive history can reliably be obtained through questionnaires after relatively long periods of time (Tilley et al, 1985;Joffe et al, 1993;Ghosh et al, 2003). In fact, in the IUI study (Ghosh et al, 2003) with the same participants, there was excellent agreement between reproductive variables, reported first pregnancy and its outcome during IUI treatment in the follow-up questionnaire and that obtained from hospital records, thus not allowing recall bias to be a serious threat to this study.…”

Section: Discussionmentioning

confidence: 70%

Pregnancy and adoption among infertile women following ovulation induction and intrauterine insemination

Ghosh

2011

Human Fertility

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Using a retrospective cohort study, 214 clinically diagnosed infertile women who underwent ovulation induction and intrauterine insemination between 1991 and 1994 at a hospital-based centre of reproductive medicine, were followed up 5 years after treatment to assess their overall health, pregnancy and adoption status. Multivariate logistic regression analysis was used to estimate odds ratios and 95% confidence intervals for these outcomes, adjusted for age, education, infertility diagnosis, infertility status, parity, number of prior intrauterine insemination cycles, pregnancy following intrauterine insemination treatment, and undergoing other assisted reproductive procedures. Significant increased likelihood of pregnancy was observed for younger women, for women with secondary versus primary infertility, and for women who underwent other assisted reproductive procedures versus those who did not. Significant decreased likelihood of adoption was observed for women with a lower versus a higher educational level, for women with secondary versus primary infertility, and for parous versus nulliparous women. Although the analyses were mostly based on self-reported data, infertile women may adopt or conceive with or without assisted reproductive techniques resulting in minimal change in overall health, and eventually adjust to infertility treatment and its aftermath.

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“…In this study, the most recent pregnancy was recalled, and more than 90% pregnancies were in the last 1.5 years. It has been documented that time about the recent pregnancy, which was recalled via a questionnaire, bears a similarity in both validity and reliability to prospective time to pregnancy [ 43 , 44 , 45 ]. Thus, recall bias is minimal in this study.…”

Section: Discussionmentioning

confidence: 99%

Low Iodine Intake May Decrease Women’s Fecundity: A Population-Based Cross-Sectional Study

Xing

Mao

et al. 2021

Nutrients

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Salt iodization is one of the most cost-effective strategies to eliminate iodine deficiency disorders (IDD). However, China’s dismantling of salt monopoly has reduced the availability of iodized salt in the susceptible population in pregnancy, which might cause IDD and have adverse health effects on both themselves and their offspring. The aim of our study was therefore to explore the association between IDD and women’s reproductive health. This is a population-based cross-sectional study conducted in 2018 in Zhejiang Province, China. A total of 1653 pregnant women participated in this study. Median urinary iodine concentration (UIC) in the population was used to assess iodine intake. Cox regression analyses were used to estimate the association between iodine intake and time to pregnancy, which was indicated with fecundability ratio (FR) and 95% confidence interval (CI). The percentage of participants with iodine deficiency who had been waiting longer than 13 months to get pregnant (20%; median UIC 119.6 μg/L) was significantly higher than those with iodine sufficiency (14%; median UIC 147.1 μg/L). A significant decrease in fecundity was observed in participants with iodine deficiency (FR, 0.820; 95% CI, 0.725−0.929) than those with iodine sufficiency. These findings indicate the importance of ongoing monitoring of iodine nutrition in women of reproductive age. Keeping a safe and optimal level of iodine nutrition during pregnancy should be emphasized.

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Long-term recall of time-to-pregnancy

Cited by 115 publications

References 10 publications

Maternal Selenium, Copper and Zinc Concentrations in Early Pregnancy, and the Association with Fertility

Maternal Selenium, Copper and Zinc Concentrations in Early Pregnancy, and the Association with Fertility

Pregnancy and adoption among infertile women following ovulation induction and intrauterine insemination

Low Iodine Intake May Decrease Women’s Fecundity: A Population-Based Cross-Sectional Study

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