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Table 3 Covariates in association with a change in intelligence quotient

From: Placental mitochondrial DNA content is associated with childhood intelligence

CovariatesMulti variable model
Change in IQ95% CIp-value
Covariates total intelligence quotient   
Girls− 2.57− 5.32 to 0.170.07
Birth weight, + IQR1.81− 0.36 to 3.980.10
Gestational age, + IQR0.17− 1.67 to 2.000.86
Birth year, + 1 year− 1.99− 3.03 to − 0.960.0002
Peripheral cord insertion1.31− 1.39 to 4.000.34
Age at measurement, + 1 year− 1.50− 3.06 to 0.060.06
High parental educational level6.994.19 to 9.79< 0.0001
Neigbourhood household income, + IQR− 0.42− 2.10 to 1.250.62
Maternal smoking during pregnancy− 1.46− 6.21 to 3.290.55
Urban environment, + IQR2.40− 0.03 to 4.830.05
Covariates verbal intelligence quotient   
Girls− 3.52− 6.24 to − 0.790.01
Birth weight, + IQR1.78− 0.37 to 3.940.11
Gestational age, + IQR− 0.13− 1.88 to 1.620.88
Birth year, + 1 year− 2.21− 3.15 to − 1.26< 0.0001
Peripheral cord insertion0.87− 1.79 to 3.540.52
Age at measurement, + 1 year− 1.83− 3.26 to − 0.400.01
High parental educational level6.764.14 to 9.38< 0.0001
Neigbourhood household income, + IQR− 0.98− 2.55 to 0.580.22
Maternal smoking during pregnancy− 2.29− 6.73 to 2.140.31
Urban environment, + IQR1.54− 0.77 to 3.840.19
Covariates performance intelligence quotient   
Girls− 1.50− 4.48 to 1.470.32
Birth weight, + IQR0.99− 1.31 to 3.280.40
Gestational age, +IQR0.51− 1.41 to 2.430.60
Birth year, + 1 year− 1.18− 2.27 to − 0.090.03
Peripheral cord insertion0.56− 2.28 to 3.390.70
Age at measurement, + 1 year− 0.71− 2.35 to 0.930.40
High parental educational level5.572.65 to 8.490.0003
Neigbourhood household income, + IQR0.14− 1.61 to 1.880.88
Maternal smoking during pregnancy− 0.09− 5.04 to 4.860.91
Urban environment, + IQR2.590.08 to 5.110.05
  1. CI confidence interval, IQR interquartile range