Table 1.
Initial data processing.
Table 2.
Comparison of net effects before and after the implementation of the policy.
Fig 1.
Classification of working-age population according to the international labor organization.
Fig 2.
Birth population during 2014–2020.
Fig 3.
Number of second births during 2014–2020.
Fig 4.
Sex ratio of birth population.
Table 3.
Principal data of respondents.
Fig 5.
Matching results by nearest neighbor matching method (a) mean (b) regression coefficient (c) error (d) P.
Fig 6.
Results of a statistical test of propensity score matching quality (a) mean (b) regression coefficient (c) error (d) P.
Fig 7.
Changes in the standard deviation of the indicators matched.
Fig 8.
Range of propensity scores.