Table 2
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Relative risk ratios (RRR) with 95% confidence interval (95% CI) of low and high birth weight by maternal origin classified by the human development index (HDI) (reference: Spanish-born) and duration of residence

NOverall effect
Duration of residence
<4
5–9
≥10
RRR95% CIRRR95% CIRRR95% CIRRR95% CI
Spanish-born (ref)97 8751111
Medium-Low HDI3 218
LBW0.70[0.55; 0.88]0.60[0.35; 1.03]0.67[0.47; 0.96]0.79[0.54; 1.14]
HBW1.74[1.54; 1.97]1.74[1.32; 2.31]1.78[1.49; 2.13]1.68[1.37; 2.06]
High HDI4 172
LBW0.70[0.57; 0.85]0.66[0.39; 1.10]0.56[0.40; 0.79]0.82[0.62; 1.08]
HBW1.59[1.41; 1.79]1.25[0.90; 1.73]1.73[1.44; 2.08]1.57[1.32; 1.87]
Very high HDI4 418
LBW0.81[0.67; 0.97]0.58[0.34; 1.01]0.76[0.56; 1.03]0.89[0.70; 1.14]
HBW1.38[1.22; 1.55]1.59[1.14; 2.22]1.44[1.19; 1.74]1.28[1.07; 1.52]
NOverall effect
Duration of residence
<4
5–9
≥10
RRR95% CIRRR95% CIRRR95% CIRRR95% CI
Spanish-born (ref)97 8751111
Medium-Low HDI3 218
LBW0.70[0.55; 0.88]0.60[0.35; 1.03]0.67[0.47; 0.96]0.79[0.54; 1.14]
HBW1.74[1.54; 1.97]1.74[1.32; 2.31]1.78[1.49; 2.13]1.68[1.37; 2.06]
High HDI4 172
LBW0.70[0.57; 0.85]0.66[0.39; 1.10]0.56[0.40; 0.79]0.82[0.62; 1.08]
HBW1.59[1.41; 1.79]1.25[0.90; 1.73]1.73[1.44; 2.08]1.57[1.32; 1.87]
Very high HDI4 418
LBW0.81[0.67; 0.97]0.58[0.34; 1.01]0.76[0.56; 1.03]0.89[0.70; 1.14]
HBW1.38[1.22; 1.55]1.59[1.14; 2.22]1.44[1.19; 1.74]1.28[1.07; 1.52]

Notes: Results adjusted for newborn’s sex, birth order, gestational age and maternal age. Ref, reference category; RRR, relative risk ratios; 95% CI, 95% confidence interval; LBW, low birth weight; HBW, high birth weight.

Table 2
Open in new tab

Relative risk ratios (RRR) with 95% confidence interval (95% CI) of low and high birth weight by maternal origin classified by the human development index (HDI) (reference: Spanish-born) and duration of residence

NOverall effect
Duration of residence
<4
5–9
≥10
RRR95% CIRRR95% CIRRR95% CIRRR95% CI
Spanish-born (ref)97 8751111
Medium-Low HDI3 218
LBW0.70[0.55; 0.88]0.60[0.35; 1.03]0.67[0.47; 0.96]0.79[0.54; 1.14]
HBW1.74[1.54; 1.97]1.74[1.32; 2.31]1.78[1.49; 2.13]1.68[1.37; 2.06]
High HDI4 172
LBW0.70[0.57; 0.85]0.66[0.39; 1.10]0.56[0.40; 0.79]0.82[0.62; 1.08]
HBW1.59[1.41; 1.79]1.25[0.90; 1.73]1.73[1.44; 2.08]1.57[1.32; 1.87]
Very high HDI4 418
LBW0.81[0.67; 0.97]0.58[0.34; 1.01]0.76[0.56; 1.03]0.89[0.70; 1.14]
HBW1.38[1.22; 1.55]1.59[1.14; 2.22]1.44[1.19; 1.74]1.28[1.07; 1.52]
NOverall effect
Duration of residence
<4
5–9
≥10
RRR95% CIRRR95% CIRRR95% CIRRR95% CI
Spanish-born (ref)97 8751111
Medium-Low HDI3 218
LBW0.70[0.55; 0.88]0.60[0.35; 1.03]0.67[0.47; 0.96]0.79[0.54; 1.14]
HBW1.74[1.54; 1.97]1.74[1.32; 2.31]1.78[1.49; 2.13]1.68[1.37; 2.06]
High HDI4 172
LBW0.70[0.57; 0.85]0.66[0.39; 1.10]0.56[0.40; 0.79]0.82[0.62; 1.08]
HBW1.59[1.41; 1.79]1.25[0.90; 1.73]1.73[1.44; 2.08]1.57[1.32; 1.87]
Very high HDI4 418
LBW0.81[0.67; 0.97]0.58[0.34; 1.01]0.76[0.56; 1.03]0.89[0.70; 1.14]
HBW1.38[1.22; 1.55]1.59[1.14; 2.22]1.44[1.19; 1.74]1.28[1.07; 1.52]

Notes: Results adjusted for newborn’s sex, birth order, gestational age and maternal age. Ref, reference category; RRR, relative risk ratios; 95% CI, 95% confidence interval; LBW, low birth weight; HBW, high birth weight.

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