Isabel dos Santos Silva
Biographic Data
| ID | 5620613 |
|---|---|
| NAME | Isabel dos Santos Silva |
| GIVEN NAMES | Isabel dos Santos |
| FAMILY NAME | Silva |
| SIGNATURE | SILVA I S |
| VERIFIED | No |
| TOTAL WORKS | 3 |
| TOTAL CITATIONS | 4 |
| WORKS AS AUTHOR | 3 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2009 |
| LATEST PUBLICATION YEAR | 2011 |
| H-INDEX | 1 |
Sample selection and validity of exposure–disease association estimates in cohort studies
BACKGROUND: Participants in cohort studies are frequently selected from restricted source populations. It has been recognised that such restriction may affect the study validity. OBJECTIVES: To assess the bias that may arise when analyses involve data from cohorts based on restricted source populations, an area little studied in quantitative terms. METHODS: Monte Carlo simulations were used, based on a setting where the exposure and one risk fact…
Validity and reproducibility of a semi-quantitative food frequency questionnaire for use among Portuguese pregnant women
This study aimed to evaluate the validity and reproducibility of a semi-quantitative food frequency questionnaire (FFQ) to estimate nutrient intake among Portuguese pregnant women. A sample of 101 pregnant women completed a 3-day food diary (FD) in each pregnancy trimester (reference method) and an interviewer-administered FFQ in the immediate post-partum period. Ranking women according to their usual intake showed that, on average, 65% were clas…
Dietary intake and nutritional adequacy prior to conception and during pregnancy
Objective To assess maternal diet and nutritional adequacy prior to conception and during pregnancy. Design Follow-up of a cohort of pregnant women with collection of questionnaire data throughout pregnancy and after delivery. Setting Antenatal clinics at two public hospitals in Porto, Portugal. Subjects Two hundred and forty-nine pregnant women who reported a gestational age below 13 weeks at the time they attended their first antenatal visit. R…
Sample selection and validity of exposure–disease association estimates in cohort studies
BACKGROUND: Participants in cohort studies are frequently selected from restricted source populations. It has been recognised that such restriction may affect the study validity. OBJECTIVES: To assess the bias that may arise when analyses involve data from cohorts based on restricted source populations, an area little studied in quantitative terms. METHODS: Monte Carlo simulations were used, based on a setting where the exposure and one risk fact…
Validity and reproducibility of a semi-quantitative food frequency questionnaire for use among Portuguese pregnant women
This study aimed to evaluate the validity and reproducibility of a semi-quantitative food frequency questionnaire (FFQ) to estimate nutrient intake among Portuguese pregnant women. A sample of 101 pregnant women completed a 3-day food diary (FD) in each pregnancy trimester (reference method) and an interviewer-administered FFQ in the immediate post-partum period. Ranking women according to their usual intake showed that, on average, 65% were clas…
Dietary intake and nutritional adequacy prior to conception and during pregnancy
Objective To assess maternal diet and nutritional adequacy prior to conception and during pregnancy. Design Follow-up of a cohort of pregnant women with collection of questionnaire data throughout pregnancy and after delivery. Setting Antenatal clinics at two public hospitals in Porto, Portugal. Subjects Two hundred and forty-nine pregnant women who reported a gestational age below 13 weeks at the time they attended their first antenatal visit. R…
Sample selection and validity of exposure–disease association estimates in cohort studies
BACKGROUND: Participants in cohort studies are frequently selected from restricted source populations. It has been recognised that such restriction may affect the study validity. OBJECTIVES: To assess the bias that may arise when analyses involve data from cohorts based on restricted source populations, an area little studied in quantitative terms. METHODS: Monte Carlo simulations were used, based on a setting where the exposure and one risk fact…
Medicine (3 works) · Birth, Development, and Health (2 works) · Cohort (2 works) · Demography (2 works) · Environmental health (2 works) · Gestation (2 works) · Internal Medicine (2 works) · Obstetrics (2 works) · Pregnancy (2 works) · Statistics (2 works)