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Concentration index (CIdx) of adverse birth outcomes and related maternal factors among urban and rural populations in Alberta (2006–2012). Weight > 91 kg pertains to pre-pregnancy weight > 91 kg. Horizontal lines indicate 95% CI around the concentration index (CIdx). Degrees of inequalities were interpreted based on the absolute value of the concentration index as low (≤ |0.05|), medium (|0.06 to 0.19|) and high (≥ |0.20|).
