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Table 2 Linear regression with functional principal component scores for the mean as dependent variable

From: Temporal patterns in count-to-tenfetal movement charts and their associations with pregnancy characteristics: a prospective cohort study

  FPC1 for mean FPC2 for mean FPC3 for mean
Univariate linear regression Multiple linear regression Univariate linear regression Multiple linear regression Univariate linear regression Multiple linear regression
Effect (95% CI) p-value Effect (95% CI) p-value Effect (95% CI) p-value Effect (95% CI) p-value Effect (95% CI) p-value Effect (95% CI) p-value
Maternal BMI I categorized
   Overweight II 0.04 0.173 0.11 0.162 −0.18 0.097* −0.13 0.093 −0.11 0.029** −0.17 0.028**
  (−0.28,1.57)   (−0.04,0.26)   (−0.39,0.03)   (−0.28,0.02)   (−0.21,-0.01)   (−0.31,-0.02)  
   Obesity III 0.09 0.007** 0.25 0.006** −0.06 0.046** −0.22 0.014** 0.02 0.711 0.02 0.824
  (0.04,2.59)   (0.07,0.42)   (−0.51,-0.01)   (−0.40,-0.04)   (−0.09,0.14)   (−0.15,0.20)  
Primiparity −0.03 0.353 −0.05 0.383 −0.13 0.119 −0.11 0.082 0.02 0.459 0.06 0.355
  (−1.09,0.39)   (−0.18,0.07)   (−0.30,0.03)   (−0.23,0.01)   (−0.05,0.11)   (−0.06,0.18)  
Anterior placental siteb 0.04 0.183 0.10 0.127 −0.15 <0.001*** −0.32 <0.001*** −0.07 0.026** −0.15 0.016**
  (−0.24,1.25)   (−0.03,0.22)   (−0.60,-0.27)   (−0.44, -0.19)   (−0.17,-0.11)   (−0.27,-0.03)  
Gestational age, days - 0.04 0.012** −0.01 0.006** 0.05 0.111 0.06 0.098 0.06 0.038** 0.08 0.021**
  (−0.08,-0.01)   (−0.17,-0.03)   (−0.00,0.11)   (−0.01, 0.13)   (0.00,0.01)   (0.00,0.15)  
  1. Level of statistical significance * < 0.1, **< 0.05, ***< 0.001.
  2. I Body Mass Index, kg/m2.
  3. II Maternal overweight (25≤BMI<30) versus maternal normal or underweight (BMI <25.00).
  4. III Maternal obesity (30≤BMI) versus maternal normal or underweight (BMI <25.00).
  5. b Predominantly anterior placental site reported from routine ultrasound examination in pregnancy week 18.
  6. Linear regression with scores on the functional principal components for the smooth curve fits for the mean as the dependent variable and basic pregnancy characteristics as explanatory variables.