Skip to main content

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