The supplemental .zip archive for this publication contains the following files. 
Stata files were created using Version 11 and may not be compatible with earlier versions.


1. Stata program file – imputation of missing data
      imputation.do

2. Stata program file – analysis (sections 4 and 5, data for section 6) 
      analysis.do

3. Stata data file – birth weight by observed family status (section 6)
      bw_unm.dta

4. Stata data file – birth weight by imputed family status (section 6)
      lbw_mar2.dta

5. Stata data file – proportions of observed and imputed family status categories (section 6)
      props.dta

6. R program file – reconstruction of trends (section 6)
      analysis.R


Note: 
The policy of the Czech Statistical Office (CSO) does not allow publication of the data. The data can be purchased from the CSO for research purposes (see http://www.czso.cz/eng/redakce.nsf/i/statistical_data_for_scientific_research_purposes).