Background & Aim: Preterm birth is the main cause of neonatal mortality and morbidity so, prevention of preterm labor is a priority in health care. This study aimed to determine relationship between house works with preterm labor.

Methods & Materials: In this case-control study, 150 term pregnant women (control group) and 150 preterm pregnant women (case group) delivered in Izadi hospital in Qom were selected in 2008-2009. The data were collected using the "physical activity in pregnancy" scale. Data were analyzed using the Chi-squared test, t-test, and logistic regression. The P-value less than 0.05 was considered as significant level and the adjusted OR was reported for all variables. We used the SPSS- 16 for analyzing the data.

Results: According to the findings, there was no significant relationship between house work regarding duration and severity of activity in pregnancy with preterm labor.

Conclusion: There was no relationship between house work in pregnancy and preterm labor. Further studies are recommended.