Table 1.

Summary of the distribution and location of data sets 1–5.

Dataset	Location of Study	Date	Community Type	Ages of Children	Number of Observations
1	Province A	2015–2016	Western China Rural Communities	6–24 months	1712
2	Provinces B and C	2015	Western China Rural Communities	6–18 months	349
3	Provinces A and D	2017	Resettlement Migration Communities	6–30 months	129
4	Provinces A and D	2017	Central China Rural Communities	6–30 months	124
5	City 1 (in Province A); City 2 (in Province D); Metropolis E	2017	Migrant Communities	6–30 months	200