. 2019 Sep 26;14(9):e0221805. doi: 10.1371/journal.pone.0221805

Table 2. Correlation of socio-demographic variables with Vitamin D level and outcome variable¹.

N = 205	Cognitive composite score	Language composite score	Social emotional composite score	Motor composite score	Language expression	Language compre-hension	Sociability score	Sooth-ability score^*	Activity^*	Attention	Positive emotion
Vitamin D nmol/L	-0.03^0.63	-0.07^0.33	0.01^0.85	-0.04^0.60	-0.05^0.51	0.07^0.36	0.16^0.025	0.23^0.001	0.17^0.015	0.04^0.62	0.07^0.32
ASSET Index	0.09^0.21	0.10^0.14	0.15^0.04	0.14 ^0.04	0.12^0.10	0.16 ^0.021	-0.07^0.33	-0.14^0.04	-0.06^0.39	-0.15^0.03	-0.02^0.76
Housing Index	0.08^0.27	-0.003^0.97	-0.10^0.15	0.05^0.51	0.07^0.35	-0.02^0.79	0.00	0.05^0.49	-0.004^0.95	-0.01^0.88	0.06^0.37
Utility Index	0.11^0.14	0.02^0.77	-0.08^0.27	0.06^0.39	-0.04^0.54	-0.02^0.83	0.09^0.19	0.02^0.77	-0.13^0.08	-0.03^0.66	0.03^0.63
Mothers’ education (years in school)	0.10^0.15	0.10^0.14	0.23^0.001	0.10^0.18	0.11^0.11	0.15^0.04	-0.03^0.64	-0.006^0.93	-0.04^0.59	-0.10^0.14	-0.006^0.94
Fathers’ education (years in school)	-0.05^0.58	0.09^0.31	0.06^0.51	-0.09^0.29	-0.02^0.87	0.05^0.55	0.15^0.03	-0.03^0.77	-0.11^0.20	-0.13^0.16	0.04^0.70
HOME score	-0.03^0.72	0.07^0.35	0.15^0.03	0.02^0.82	0.10^0.15	0.20^0.005	-0.30^<0.001	-0.34^<0.001	-0.19^0.006	-0.39^<0.001	-0.32^<0.001
Mothers’ age in years	0.03^0.66	0.02^0.82	-0.17^0.02	0.06^0.41	-0.19^0.01	-0.05^0.49	0.11^0.12	0.07^0.34	0.06^0.40	0.09^0.21	0.04^0.55
Birth-weight (kg)	0.20 ^0.005	0.10^0.15	0.01^0.92	0.26^<0.001	0.16^0.03	0.09^0.22	0.08^0.24	0.04^0.62	0.04^0.55	0.007^0.93	-0.02^0.79
Child’s age in months during test	0.02^0.76	-0.11^0.13	0.06^0.37	-0.06^0.38	-0.008^0.92	0.03^0.67	-0.10^0.15	-0.07^0.32	-0.05^0.46	-0.15^0.04	-0.08^0.23
height- for- age Z score around 7-months	0.15^0.04	0.005^0.94	0.03^0.64	0.22^0.001	0.08^0.24	0.07^0.32	0.14^0.05	0.05^0.46	0.15^0.04	-0.03^0.72	0.005^0.94
Head size around 7 months	0.18^0.01	0.03^0.71	0.01^0.88	0.05^0.49	0.15^0.04	0.11^0.12	0.13^0.06	0.13^0.07	0.06^0.42	0.05^0.48	0.10^0.15

Bi-variate (Spearman’s) correlation, HOME = Home observation of measuring environment; BMI = Body mass index

¹Values are in correlation co-efficient with p-values in superscript

*Values are log₁₀ transformed for mild positive skeweness

Table 2. Correlation of socio-demographic variables with Vitamin D level and outcome variable1.

Table 2. Correlation of socio-demographic variables with Vitamin D level and outcome variable¹.