This appendix formed part of the original submission and has been peer reviewed. The journal post it as supplied by the authors.
Supplement to: Alkema L, Chao F, You D, Pedersen J, Sawyer CC. National, regional, and global sex ratios of infant, child, and under-5 mortality and identification of countries with outlying ratios: a systematic assessment. Lancet Glob Health 2014; 2: e521–30.