Pregnancy and Employment: A Literature Review - Crisis Pregnancy ...
Pregnancy and Employment: A Literature Review - Crisis Pregnancy ...
Pregnancy and Employment: A Literature Review - Crisis Pregnancy ...
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<strong>Pregnancy</strong> <strong>and</strong> <strong>Employment</strong>: A <strong>Literature</strong> <strong>Review</strong><br />
53 reports over a nine-year period 16 , which related these adverse outcomes to five common occupational<br />
exposures: prolonged working hours, shift work, lifting, st<strong>and</strong>ing <strong>and</strong> heavy physical workload. They find extensive<br />
<strong>and</strong> consistent evidence relating each of these exposures to pre-term delivery. For ‘small for gestational age’, the<br />
position was similar, but the evidence base was more limited. For pre-eclampsia <strong>and</strong> gestational hypertension,<br />
they found the studies were too small to allow firm conclusions.<br />
Similarly, Mozurekewich et al (2000) evaluate the association between working conditions <strong>and</strong> adverse<br />
pregnancy outcomes. This study conducted a meta-analysis of 160,988 women in 29 studies to evaluate the<br />
association of occupational exposures – which included physically dem<strong>and</strong>ing work, prolonged st<strong>and</strong>ing, long<br />
working hours, shift work, <strong>and</strong> cumulative work fatigue – with pre-term birth, hypertension or pre-eclampsia<br />
<strong>and</strong> small-for-gestational-age infants. This study found that physically dem<strong>and</strong>ing work <strong>and</strong> prolonged st<strong>and</strong>ing<br />
were significantly associated with pre-term birth <strong>and</strong> hypertension or pre-eclampsia, but found no significant<br />
association between long work hours <strong>and</strong> pre-term birth.<br />
Interestingly, a study by Pompeii et al (2005) found that physically dem<strong>and</strong>ing work does not seem to be<br />
associated with adverse pregnancy outcomes, but did find that night-work during pregnancy may increase the<br />
risk of pre-term delivery. Conducting the study through clinic <strong>and</strong> hospital settings in Central North Carolina, the<br />
researchers used specific indicators – st<strong>and</strong>ing, lifting, night-work, or long hours – to assess if they are associated<br />
with an increased risk of pre-term or small-gestational-age birth. Similarly, Liang Zhu et al (2004) estimate the<br />
effect of shift work on the duration of pregnancy <strong>and</strong> birth-weight using the Danish National Birth Cohort. This<br />
study also pointed to night work in particular <strong>and</strong> its impact on prolonging pregnancy duration <strong>and</strong> reducing foetal<br />
growth, especially among industrial workers (Liang Zhu et al, 2004).<br />
Despite some inconsistencies in the scientific literature, the reports recommend preventative measures should<br />
be taken <strong>and</strong> advise against long working hours, prolonged st<strong>and</strong>ing <strong>and</strong> heavy physical work, particularly in late<br />
pregnancy. Saurel-Cubizolles et al (2004) suggest that the inconsistencies may result from the great variety of<br />
indicators used to evaluate exposure to physical workload during pregnancy (st<strong>and</strong>ing, walking, heavy lifting,<br />
physical exertion, heavy work, etc).<br />
In Irel<strong>and</strong>, the impact of working while pregnant has received little attention in relation to birth outcomes. One<br />
exception is a study by Niedhammer et al (2009), which examines the predictive effects of various occupational<br />
factors on pregnancy outcomes including birth-weight, pre-term delivery <strong>and</strong> small-for-gestational-age. Using<br />
a cohort of 1,124 pregnant women, this study found significant associations between physical work dem<strong>and</strong>s<br />
<strong>and</strong> low birth-weight (