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Table 1 Characteristics of the sample by term and preterm birth.

From: Behavioural symptoms of attention deficit/hyperactivity disorder in preterm and term children born small and appropriate for gestational age: A longitudinal study

  Term (n = 656) Preterm (n = 172)   
  Mean (SD)/ Mean (SD)/   
  n (%) n (%) p1 p2
Prenatal and maternal characteristics     
   Girl (n/%) 302 (46.0) 73 (42.4) 0.40 0.38
   Multiple birth (n/%) 15 (2.3) 29 (16.9) < 0.001 < 0.001
   Mother's smoking during pregnancy (n/%)     
> 10 39 (5.9) 9 (5.2) 0.90 0.52
1-10 104 (15.9) 39 (22.7) 0.04 0.07
none 513 (78.2) 124 (72.1) - -
   Mother's age (years) 29.32 (5.1) 29.65 (5.2) 0.45 0.53
   Mother's height (cm) 164.18 (5.3) 164.29 (5.6) 0.80 0.50
   Mother's BMI at the end of pregnancy (m2/kg) 27.55 (4.1) 26.26 (3.5) < 0.001 < 0.001
   Mother's change in weight during pregnancy (kg) 11.83 (4.5) 9.98 (4.9) < 0.001 < 0.001
Birth characteristics     
   Birth weight (grams) 3513 (533) 2282 (604) - < 0.001
   Gestational age (weeks) 39.4 (1.3) 34.0 (2.4) - < 0.001
   Birth weight standard deviation score 0.0 (1.1) -0.66 (1.3) - < 0.001
Parental educational attainment (n/%)     
High 153 (23.3) 38 (22.1) - -
Upper middle 187 (28.5) 49 (28.5) 0.83 0.76
Lower middle 240 (36.6) 61 (35.5) 0.92 0.92
Low 76 (11.6) 24 (14.0) 0.42 0.53
Child's General Reasoning at 56 months* 100.0 (17.2) 97.7 (16.6) 0.14 0.14
  1. Note. p1 = Unadjusted associations, p2 = Adjusted for SGA vs. AGA status. * Missing values, N = 47