Main Findings
This study comprehensively examined the associations of the COVID-19
lockdown with gestational length and risk of PTB using a large database
from South China. We found that the lockdown exposure was significantly
associated with a slightly shorter gestational length and a moderately
higher risk of PTB. These associations were greater among women who were
in early or middle pregnancy during the Level I lockdown period. There
were also significant exposure-response associations of higher
cumulative exposures to lockdown with a shorter gestational length and
an increased risk of PTB.