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Table 2 Characteristics of the sample by AGA and SGA status.

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

  AGA (n = 761) SGA (n = 67)   
  Mean (SD)/ Mean (SD)/   
  n (%) n (%) p1 p2
Prenatal and maternal characteristics     
   Girl (n/%) 344 (45.2) 31 (46.3) 0.87 0.76
   Multiple birth (n/%) 27 (3.5) 17 (25.4) < 0.001 < 0.001
   Mother's smoking during pregnancy (n/%)     
> 10 38 (5.0) 10 (14.9) < 0.001 0.001
1-10 128 (16.8) 15 (22.4) 0.15 0.20
none 595 (78.2) 42 (62.7) -  
   Mother's age (years) 29.88 (5.2) 29.34 (5.1) 0.41 0.47
   Mother's height (cm) 164.34 (5.4) 162.51 (4.7) 0.01 0.01
   Mother's BMI at the end of pregnancy (m2/kg) 27.32 (4.0) 26.83 (3.7) 0.33 0.68
   Mother's change in weight during pregnancy (kg) 11.51 (4.64) 10.73 (4.4) 0.19 0.53
Birth characteristics     
   Birth weight (grams) 3363 (670) 2054 (366) < 0.001 -
   Gestational age (weeks) 38.4 (2.7) 37.0 (2.5) < 0.001 -
   Birth weight standard deviation score 0.1 (0.9) -2.7 (0.5) < 0.001 -
Parental educational attainment (n/%)     
High 178 (23.4) 13 (19.4) - -
Upper middle 223 (29.3) 13 (19.4) 0.58 0.55
Lower middle 271 (35.6) 30 (44.8) 0.23 0.23
Low 89 (11.7) 11 (16.4) 0.22 0.27
Child's General Reasoning at 56 months* 99.6 (17.1) 99.1 (17.1) 0.82 0.99
  1. Note. p1 = Unadjusted associations, p2 = Adjusted for term vs. preterm birth. * Missing values, N = 47