Midday meals as an early childhood nutrition intervention: evidence from plantation communities in Sri Lanka

BMC Public Health

Table 12 IV regression model results- by Birth-Year Cohort

	IV– Random Effects Regression
	2007–2009			2010–2012			2013–2015
	WAZ	HAZ	WHZ	WAZ	HAZ	WHZ	WAZ	HAZ	WHZ
Treatment var
Trt	0.003 (0.020)	0.046* (0.021)	−0.011 (0.030)	0.008 (0.006)	0.044** (0.014)	0.005 (0.022)	0.073** (0.018)	−0.008 (0.051)	0.195** (0.055)
Other controls?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Observations	2468	1878	1281	11,192	7562	5835	3554	869	667
σ_u	0	0	0	0	0.098	0	0	0.142	0
σ_e	1.438	2.180	0.615	0.401	0.274	0.892	0.756	0.389	0.763
ρ	0	0	0	0	0.113	0	0	0.118	0
Kleibergen-Paap LM Stat	0.27	31.08**	25.97**	8.73*	91.40**	36.65**	20.72**	17.80**	15.88**
Cragg-Donald Wald F Stat	0.72	458.22	194.30	43.68	858.58	180.00	114.15	360.20	60.80
Sargan-Hansen Test	2.036	0.081	0.116	0.040	1.227	11.552**	1.194	4.262*	3.522

Robust standard errors in parenthesis, **p < 0.01, *p < 0.05, + p < 0.1
K-P LM test [Null: matrix of reduced form coefficients has rank = K1–1 (underidentification)], C-D Wald F Test [Null: Equation is weakly identified], S-H Test [Null: Overidentification restriction is satisfied]. Other controls include child age, age squared, gender, zscore of first weight, zscore of birthweight, zscore of first height, pcare, ethnicity, CDC status and birth-year fixed effects either as direct controls or instruments

ISSN: 1471-2458