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Table 4 Spearman’s rank correlations of small for gestational age (SGA) and low birth weight at term (LBWT) with air substances, land sources, and weighted sum overlay indices for the entire province of Alberta

From: Mapping outdoor habitat and abnormally small newborns to develop an ambient health hazard index

Index name Inputs SGA rho LBWT rho
Air substances Sum of 136 variables classified to 5 quantiles 0.21 0.16
Land sources Sum of 18 variables classified to 5 quantiles − 0.26 − 0.23
Overlay equal Air substances + land sources 0.18 0.13
Overlay 0.7/0.3 0.7 * air substances + 0.3 * land sources 0.15 0.20