Association of demographic and in utero chemical and home environmental variables with MDI and PDI scores of BSID II at 36 months from birth (n = 70).

Bivariate and multivariate associations between in utero chemical and home environmental variables and covariates with BSID II clusters were shown in the table.Model 1a: Bivariate regression analysis was conducted to see the unadjusted association between all the “explanatory variables (in utero Pb, As, and Zn level and HOME Score)” and “covariates (i.e., mother’s age, parity, mother’s education level, family income, mother’s BMI just before delivery, weight of the infant at birth and 36 months after birth, gestational age and infant’s age at the time of BSID II assessment)”.Model 2b: Multivariate regression model was conducted to see the mutually adjusted effect of explanatory variables, and covariates, on response variables. Out of 100 cohort mother infant pairs recruited, although cord blood Pb level was available for 79 participants, and HOME score was available for 74 participants, only 70 participants (n = 70) who had complete sets of data available for analysis were considered in the model.Model 3c: In this model, “parity, family income, mother’s BMI just before delivery, weight of the infant at birth” were dropped from fully adjusted model (Model 2) to see the “minimum” adjusted effect of explanatory variables, and covariates, on response variables.Association of demographic and in utero chemical and home environmental variables with MDI and PDI scores of BSID II at 36 months from birth (n = 70).