Fig. 2
From: Associations of COVID-19 lockdown with gestational length and preterm birth in China
Approach to calculating individual cumulative exposure dose to lockdown in the first 22 GWs.
: Weeks after 22 GWs. Note: A, B, C, D and E represent subgroups of pregnant women with different GWs during the Level I lockdown; We assigned a weighting value of 3 to the days with Level I response, 2 to the days with Level II response, 1 to the days with Level III response, and 0 to days before lockdown (no exposure)