Biopsychosocial Determinants of Pregnancy Length and Fetal Growth
Référence bibliographique 
St-Laurent, Jennifer, De Wals, Philippe, Moutquin, Jean-Marie, Niyonsenga, Théophile, Noiseux, Manon et Czernis, Loretta. 2008. «Biopsychosocial Determinants of Pregnancy Length and Fetal Growth ». Paediatric and Perinatal Epidemiology, vol. 22, no 3, p. 239-248.
Intentions : « [A]ssess the direct and indirect effects of psychosocial and biomedical factors on the duration of pregnancy and fetal growth. » (p. 240)
Questions/Hypothèses : What are « [...] the causes and mechanisms related to preterm delivery and intrauterine growth restriction [...]. » (p. 240)
Échantillon/Matériau : 2685 femmes enceintes
Instruments : Questionnaires auto-administré
Type de traitement des données : Analyse statistique
« Theoretical models explaining pregnancy length and fetal growth were developed and tested, using path analysis. In order to reduce the number of variables from the questionnaire, a principal component analysis was performed, and the three most important new dimensions were retained as explanatory variables in the final models. The biophysical score, covering both maternal age and the pre-pregnancy body mass index, was the only variable statistically associated with pregnancy length. Smoking, obstetric history, maternal health and biophysical indices were direct predictors of fetal growth. Perceived stress, social support and self-esteem were not directly related to pregnancy outcomes, but were determinants of smoking and the above-mentioned biomedical variables. More studies are needed to identify the mechanisms by which adverse psychosocial factors are translated into adverse biological effects. » (p. 240)
Measuring the Intensity of Pregnancy Planning Effort
Référence bibliographique 
Pascale, Morin, Payette, Hélène, Moos, M. Kerry, St-Cyr-Tribble, Denise, Niyonsenga, Théophile et De Wals, Philippe. 2003. «Measuring the Intensity of Pregnancy Planning Effort ». Paediatric and Perinatal Epidemiology, vol. 17, no 1, p. 97-105.
Intentions : « The ultimate goal of the exercise is to propose a standard measurment of pregnancy planning effort in order to promote health behaviours, such as folic acid intake, to women planning a pregnancy. » (p. 98)
Échantillon/Matériau : 448 femmes Instruments : Questionnaire Type de traitement des données : Analyse statistique
« This study validated a measure of pregnancy planning effort based on Miller’s conceptual framework in two clinical settings. The questionnaire’s main items deal with general behaviour with regard to pregnancy, timing and proception (proception being the reverse of contraception). Values for these three items are added to yield a continuous score ranging from 0 to 12. The study population comprised 448 women of different cultural backgrounds recruited in prenatal, fertility and family planning clinics in Quebec and North Carolina. The results indicate that the internal consistency between the three items pertaining to pregnancy planning was excellent (Cronbach’s alpha of 0.83). Test-retest reliability after a 4-week interval was excellent, with an intraclass correlation coefficient of 0.86 for the planning score. The planning score median for women attending family planning clinics (1.00) was significantly lower than that for those recruited in fertility clinics (11.00), confirming the discriminant ability of the instrument. Path analysis shows that the conceptual model corroborates the observed data and explains 53% of the pregnancy planning variability. In conclusion, this is the first questionnaire specifically designed to assess the intensity of pregnancy planning effort, a potentially important variable in epidemiological studies and clinical practice. » (p. 97)